Sterilisation of Males Under Guardianship: The Risk Threshold and the Best Interests Test

An Analysis of AB [2026] WASAT 31

1. Introduction

In AB [2026] WASAT 31, the State Administrative Tribunal (SAT) refused an application by a represented person’s guardian for the Tribunal’s consent to the carrying out of a vasectomy under s 59(1) of the Guardianship and Administration Act 1990 (WA) (GA Act). The decision is notable for several reasons. It is only the second reported case in which a Tribunal has been required to determine whether to consent to the sterilisation of a male represented person by vasectomy, following JC [2026] WASAT 13 delivered only weeks earlier. More significantly, it crystallises the practical threshold of risk that must be established before sterilisation can be found to be in a represented person’s best interests.

The majority’s reasoning establishes that, even where the psychological consequences of fatherhood would be catastrophic for the represented person, sterilisation will not be authorised where the current risk of sexual activity is assessed as negligible. The dissenting opinion of Dr Winterton provides a counterpoint, reasoning that even a low-probability risk justifies sterilisation where the severity of the consequence is sufficiently grave. This divergence on risk tolerance has direct implications for the way practitioners advise guardians contemplating such applications.

The decision warrants attention from practitioners in guardianship and administration, disability law, and health law. It provides a comprehensive worked example of the multi-factorial best interests analysis required by s 63 of the GA Act, and demonstrates the Tribunal’s insistence that sterilisation remains a measure of last resort—even where the represented person’s own expressed wishes appear to favour it.

2. Relevant Legal Framework

2.1 The Statutory Scheme

The sterilisation of a represented person is governed by Division 3 of Part 5 of the GA Act. Section 57(1) makes it an offence to carry out a sterilisation procedure on a represented person unless specified requirements are met. Those requirements, as summarised by the Tribunal at [7], are threefold: (a) both the guardian and the Tribunal must have consented in writing; (b) all rights of appeal under s 63 must have lapsed or been exhausted; and (c) the sterilisation must be carried out in accordance with any conditions imposed under the GA Act.

Section 58(1) prohibits the guardian from consenting until the Tribunal’s consent is first obtained. Section 56A requires that any decision on a sterilisation application be made by a Full Tribunal, defined in s 3 as the President or a Deputy President together with two other members. These procedural safeguards reflect the gravity of sterilisation decisions and the inherent difficulty in disentangling the represented person’s interests from those of their carers (at [5]).

Section 63 provides the substantive test: the Tribunal may consent to sterilisation if it is satisfied that sterilisation is in the best interests of the represented person. The GA Act does not prescribe the matters that must be considered in applying this test (at [8]).

Notably, the definition of “procedure for the sterilisation” in s 56 excludes a lawful procedure carried out for a lawful purpose other than sterilisation that incidentally results, or may result, in sterilisation. As the Tribunal in EW [2021] WASAT 111 identified, to “sterilise” means to deprive a person of fecundity or to render them incapable of producing offspring (at [10]).

2.2 The Common Law Framework

The leading authority on the sterilisation of persons with intellectual disability remains Secretary, Department of Health and Community Services v JWB and SMB (1992) 175 CLR 218 (Marion’s Case). Although that decision concerned a child, its principles have been adopted in the guardianship context. Brennan J held that sterilisation required “compelling justification” (at 268–269). The majority held that sterilisation was a “step of last resort” to be undertaken only when alternative and less invasive procedures had failed or it was certain that no other treatment would work (at 259–260).

In Re Jane (1988) 94 FLR 1, the Family Court similarly emphasised the seriousness of sterilisation and the need for rigorous scrutiny of the justification advanced.

In EW [2021] WASAT 111, the Tribunal held that if there is no real likelihood that a represented person will engage in sexual activity, it is difficult to see how the sterilisation procedure could be necessary and in their best interests (at [82]). This proposition was adopted in JC [2026] WASAT 13 at [39] and again in the present case at [9].

The Tribunal in JC developed a comprehensive ten-factor framework for assessing sterilisation applications, which was adopted in full in AB at [8]. That framework is discussed in detail at Section 4 below.

Finally, the Tribunal at [7] cited the observation of O’Brien J in Director Clinical Services, Child & Adolescent Health Services and Kiszko [2016] FCWA 75; (2016) 312 FLR 319 at [101], that the determination of best interests is “not a precise science” but rather “multifaceted and complex” and “susceptible to very different conclusions being drawn by different people of equal compassion, sincerity and integrity.”

3. The Facts of the Case

3.1 The Represented Person

AB is a 19-year-old male with a severe intellectual disability and autism spectrum disorder, diagnosed in early childhood. His cognitive capacity has been assessed as equivalent to that of a child between 5 and 7 years old. These conditions are static and not expected to improve (at [16]). AB also has a number of other chronic health conditions (at [16](d)).

AB’s parents have been appointed as his limited guardians with functions including the power to make treatment decisions, subject to Division 3 of Part 5 of the GA Act (at [10]).

3.2 The Application

AB’s mother applied under s 59(1) for the Tribunal’s consent to a vasectomy. AB’s father supported the application. The vasectomy was proposed to be carried out at the same time as a cystoscopy that AB required to investigate a possible urethral stricture, thereby avoiding a second anaesthetic and hospital admission (at [19]).

3.3 The Evidence

The Tribunal received oral evidence from AB, his parents, his general practitioner (the GP), and an investigator appointed by the Public Advocate (the Investigator). Documentary evidence included a joint statement from AB’s parents, reports from the GP, the treating urologist (the Urologist), a psychologist (the Psychologist) and a functional capacity report (at [13]).

3.4 Key Factual Findings

The Tribunal made the following material findings of fact:

Capacity. AB has no understanding, nor any capacity to understand, the purpose of a vasectomy, its permanent implications, the surgical steps involved, its risks, or post-operative requirements (at [16](e)). He does not have the intellectual capacity to make a reasonable decision about whether to undergo the procedure (at [18]).

Expressed wishes. AB has consistently said that he does not want children, telling his GP, the Urologist and the Psychologist on multiple occasions that he is “retired from having children.” He told the Tribunal that the idea of children made him feel “very sad” and “useless” (at [28]–[31]). The topic causes him marked distress, including visible physical manifestations: bending over, covering his head, rocking, and ultimately leaving the hearing room (at [32]).

Effect of fatherhood. The Psychologist expressed the view that AB was likely to suffer “serious and unmanageable trauma” and a “catastrophic collapse” in the event of unplanned fatherhood (at [38]). The Tribunal accepted this evidence and found that if AB fathered a child and became aware of that fact, he would experience distress that would be “psychologically damaging and have a seriously adverse impact on his capacity to function” (at [41]).

Sexual understanding and activity. AB does not understand the concept of sex, has no understanding of its consequences, and has expressed no desire for a sexual relationship (at [48]–[50]). He does experience sexual arousal and is physically capable of forming and maintaining an erection (at [44]–[45]). The Tribunal found that the risk of AB initiating sexual activity was “negligible” (at [50]).

Vulnerability. AB is extremely vulnerable to exploitation. He has a tendency to comply with others’ wishes in order to please and be liked (at [56]–[57]). The Psychologist considered that his intellectual disability and lack of awareness of risk made him “particularly vulnerable to sexual exploitation” (at [58]).

Former relationship. AB had a long relationship with a girl with an intellectual disability, lasting approximately two to three years, which ended shortly before the hearing. The relationship had no sexual component. However, at one point the girlfriend announced that “they wanted to have sex.” AB’s parents managed this by ensuring they were not left alone (at [66]–[68]).

Supervision. AB requires almost constant care. He attends structured activities on five days per week and lives with his parents. He is left alone for short periods but does not tend to stray far from his home (at [60]–[61]). His parents have plans to place him in a supported living facility in the coming years (at [51]).

Alternative contraception. The only alternative contraceptive measure—the use of condoms—requires organisational capacity beyond AB’s abilities (at [23]). The Tribunal found there were no reasonable alternative contraceptive measures available (at [24]).

4. Analysis of the Tribunal’s Reasoning

4.1 The Ten-Factor Framework

The Tribunal adopted the ten-factor framework articulated in JC at [37] for assessing whether sterilisation is in the represented person’s best interests (at [8]). That framework addresses: (a) the represented person’s views about having children; (b) the likelihood of changing those views; (c) the likelihood of the represented person having children without the procedure; (d) the likely effect on the represented person if a child were conceived; (e) the extent of physical invasion and effect on self-perception; (f) risks and side effects; (g) availability of alternative contraceptive measures; (h) the likelihood of future improvement in capacity; (i) the likelihood of development of alternative contraception; and (j) whether the application is made in good faith.

4.2 The Majority’s Reasoning

The majority (Judge Vernon, Deputy President, and Member Sadleir) accepted that several factors favoured granting consent. They found that the psychological harm to AB from fatherhood would be catastrophic (at [41]); that AB consistently expressed a wish not to have children (at [33]); that there were no reasonable alternative contraceptive measures (at [24]); that a vasectomy carried relatively low surgical risk, especially if performed concurrently with the cystoscopy (at [21]); and that the application was made in good faith (at [79]).

However, the majority identified the “crucial issue” as whether there was any real prospect that AB might father a child, either at the present time or in the reasonably foreseeable future, such that the adverse consequences might eventuate (at [42]). On this critical question, the majority found that it was “highly unlikely” that AB would engage in sexual relations with a female (at [78]). This finding rested on three pillars: AB’s demonstrated lack of interest in sexual activity (at [50]); his current level of supervision (at [60]–[61]); and the evidence that his parents had managed the risk during his prior relationship (at [73], [76]).

The majority acknowledged two potential pathways to AB fathering a child. The first was sexual assault by a person with intellectual capacity. The Tribunal dismissed this as a basis for sterilisation, reasoning that a vasectomy would not lessen the risk of sexual assault itself, and that it was “highly unlikely” that AB would ever become aware of any child conceived in such circumstances (at [64]–[65]). The second was consensual activity with a female partner with an intellectual disability. The Tribunal accepted that AB was capable of forming such a relationship and that there were reasonable prospects he would do so in the future (at [71]). However, the evidence showed that AB’s prior relationship had no sexual component, and that the risk had been managed by parental supervision (at [73]).

Critically, the majority held that the level of supervision AB currently required would not be “significantly reduced” by a vasectomy (at [75]–[76]). AB’s mother herself described the benefit of a vasectomy as only removing an additional “layer” of monitoring and allowing them to step back “slightly” (at [74]). The majority concluded that the concern about the effect of AB’s likely distress if he became aware of fathering a child was “insufficient to support a finding that the sterilisation procedure is in his best interests” given the very low probability of the triggering event (at [78]).

The majority also considered and dismissed several subsidiary arguments. The possibility of AB passing on a genetic condition to any child lacked supporting medical evidence and was therefore speculative (at [86]–[89]). The stress placed on AB’s parents by their worry was a relevant but insufficient consideration (at [90]–[92]). The possibility of a child making a claim on AB’s estate could be addressed through estate planning (at [95]).

4.3 The Dissenting Opinion

Dr Winterton, Senior Sessional Member, agreed with the majority’s statement of the law and findings of fact but reached a different conclusion (at [100]). Dr Winterton reasoned that because AB was capable of entering into a relationship with a woman and there were reasonable prospects he would do so in the future, sexual intercourse “may happen, with the risk of pregnancy following” (at [102]). Given the finding that AB would experience a high level of distress if he fathered a child, with potentially significant consequences for his functioning, Dr Winterton considered it was in AB’s best interest to undergo a vasectomy now.

Additionally, Dr Winterton identified a quality-of-life argument: on the evidence, AB may be given more freedom to interact with a female partner, including engaging in sexual intercourse, if there were no risk of his fathering a child (at [103]). In Dr Winterton’s view, this may result in AB having a greater quality of life.

The divergence between the majority and the dissent reflects a fundamental difference in risk tolerance. The majority required a real prospect of the feared event occurring before sterilisation could be justified. Dr Winterton appears to have applied a lower threshold, accepting that the possibility of the event occurring, when combined with the severity of its consequences, was sufficient.

5. Assessing the Consequences

The practical consequences of the majority’s approach are significant for future sterilisation applications.

The risk threshold. The majority’s reasoning establishes that the test under s 63 is not simply whether sterilisation would remove a risk of harm. Rather, the risk of the harm materialising must itself be assessed, and where that risk is low, the severity of the consequences is not determinative. This is consistent with the “step of last resort” principle from Marion’s Case, but applies it in a way that may be uncomfortable for guardians who perceive even a small probability of catastrophic harm as warranting preventive action.

Supervision as a mitigating factor. The majority placed significant weight on the fact that AB’s current supervision arrangements effectively managed the risk of sexual activity. This creates a tension for practitioners: on the one hand, evidence of effective supervision reduces the assessed risk and militates against sterilisation; on the other hand, it imposes an ongoing supervisory burden on carers that sterilisation might alleviate. The majority resolved this tension by finding that AB required constant care in any event, so a vasectomy would not materially reduce the supervision required (at [75]–[76]).

The door left open. The majority expressly noted that AB is a young man whose circumstances may change, and that if a relevant change occurs, his parents may make a further application (at [98]). This indicates that a sterilisation application is not assessed on a once-and-for-all basis but is responsive to evolving circumstances. A change such as AB entering a supported living facility with less intensive supervision, or forming a relationship with a sexual component, could provide the factual foundation for a renewed application.

The sexual assault pathway. The majority’s treatment of the sexual assault concern is significant. By finding that a vasectomy would not reduce the risk of sexual assault itself, and that AB would be unlikely to become aware of any child conceived by sexual assault, the Tribunal effectively foreclosed reliance on the sexual assault pathway as a justification for sterilisation in most cases (at [64]–[65]).

6. Worked Example

Consider the following hypothetical. CD is a 28-year-old female with a moderate intellectual disability. She has a cognitive capacity equivalent to a 10-year-old. CD lives in a supported living facility with overnight staff supervision but is largely unsupervised during daytime activities. CD has been in a relationship with a male resident of the same facility for approximately 12 months. Staff have observed physical affection between them, including kissing and embracing, and have on one occasion found them together in CD’s bedroom with the door closed. CD has told staff that she and her partner “love each other.” CD’s guardian, her sister, applies for the Tribunal’s consent to a sterilisation procedure.

Arguments for the applicant

Applying the ten-factor framework from JC as adopted in AB, the applicant would emphasise the following. Unlike AB, CD is in an active relationship with a sexual component that is progressing toward intercourse. The level of supervision, while present, has not prevented intimate contact. CD’s cognitive capacity, while higher than AB’s, is insufficient to understand the responsibilities of parenthood or to use contraception independently. The risk of CD engaging in unprotected sexual activity is not merely theoretical but is supported by direct observational evidence. The consequences of an unplanned pregnancy for CD—including the physical demands of pregnancy, the psychological impact, and the potential removal of a child by child protection authorities—would be severe. Unlike in AB, the current supervisory arrangements have not effectively managed the risk.

Arguments for the Public Advocate or represented person

The respondent would argue that CD’s higher cognitive capacity means there is a greater prospect that she can be taught to use contraception, such as an implant or injection, which would be less invasive and reversible. The fact that CD appears to welcome the relationship and expresses affection for her partner raises the possibility that she may, in the future, wish to have children, and at 28 she is still of an age where that wish could emerge. A long-acting reversible contraceptive could be trialled before the “last resort” of sterilisation is pursued. The respondent would also argue that sterilisation does not protect against sexually transmitted infections and that the facility’s supervisory arrangements should be improved rather than CD’s reproductive capacity permanently removed.

On the majority’s reasoning in AB, this hypothetical is distinguishable. The real prospect of sexual activity—the factor that was absent in AB’s case—is present. However, the availability of alternative, less invasive contraceptive measures may still mean that sterilisation is not a step of last resort, depending on whether a trial of such measures has been undertaken.

7. Practitioner Guidance: A Step-by-Step Framework

The following framework is derived from the principles established in AB, read with JC, EW and Marion’s Case.

Step 1: Confirm jurisdiction and standing. Verify that a guardianship order is in force and that the applicant is the represented person, the guardian, or the Public Advocate (s 59(1)). Confirm that the guardian’s functions include treatment decisions subject to Division 3 of Part 5 (at [10]).

Step 2: Obtain expert evidence on the nature of the procedure. Secure a report from the treating specialist addressing the procedure, its permanence, risks, side effects, and whether reversal is feasible. If the procedure can be combined with another medically necessary procedure to reduce the burden on the represented person, that should be documented (at [19]).

Step 3: Assess the represented person’s capacity and views. Obtain evidence, ideally from a psychologist or psychiatrist, as to the represented person’s cognitive capacity, whether they understand the concept and consequences of sterilisation, and their expressed wishes regarding having children. Note that the represented person’s wishes are relevant but not determinative where they lack the capacity to understand the implications (at [36]).

Step 4: Assess the likelihood of sexual activity. This is the critical threshold question. Gather evidence addressing whether the represented person has any understanding of sexual activity, whether they have expressed any desire for sexual relationships, whether they are in or have been in a relationship with a sexual component, and whether they have engaged in any sexually motivated behaviour. The Tribunal’s reasoning in both EW (at [82]) and AB (at [42]) makes clear that without a “real prospect” of sexual activity, sterilisation is unlikely to be found to be in the represented person’s best interests.

Step 5: Assess the consequences of the represented person having a child. Obtain psychological evidence addressing the likely effect on the represented person of learning they had become a parent. The Tribunal gave significant weight to evidence of likely “catastrophic collapse” in AB’s case (at [38]), and identified this as the most important factor favouring consent (at [37]). However, this factor alone is insufficient without a corresponding finding of real risk.

Step 6: Investigate alternative contraceptive measures. Identify all available alternatives to sterilisation, assess whether the represented person is capable of using them, and determine whether any have been tried and failed. Sterilisation is a step of last resort (Marion’s Case at 259–260). The absence of any reasonable alternative strengthens the application (at [24]).

Step 7: Address the supervision context. Be aware that evidence of effective supervisory arrangements may cut both ways. Where current supervision effectively manages the risk, the Tribunal may conclude that sterilisation is unnecessary (at [76]). Conversely, if a change in living arrangements is imminent that will reduce the level of supervision, this should be documented and evidenced.

Step 8: Demonstrate good faith. Ensure the application clearly distinguishes between the represented person’s interests and the interests of the guardian or family members. The Tribunal is alert to the difficulty of disentangling these interests (at [5]). Be prepared for the Tribunal to scrutinise subsidiary concerns—such as the financial burden of raising a grandchild, claims on the represented person’s estate, or the inconvenience of supervising the represented person—and to assess whether these are properly characterised as concerns about the represented person’s welfare.

Step 9: Engage with the Public Advocate. The Tribunal may request the Public Advocate to provide an independent view of the represented person’s best interests (at [12]). Practitioners should co-operate with the Public Advocate’s investigator and provide access to the represented person. The investigator’s evidence may carry significant weight, particularly where it provides independent corroboration of the clinical evidence.

Step 10: Consider timing and changed circumstances. If the application is likely to fail on the current evidence, consider whether it is premature. The Tribunal in AB expressly left open the possibility of a further application if circumstances change (at [98]). A change in the represented person’s living arrangements, the development of a relationship with a sexual component, or the failure of alternative contraceptive measures may provide a stronger factual foundation.

8. Evidence and Arguments Available to Each Side

8.1 Arguments for the Applicant (Guardian)

Practitioners acting for a guardian should focus on the following categories of evidence and argument:

Severity of consequences. Psychological and psychiatric evidence demonstrating the likely impact on the represented person of learning they had become a parent. In AB, the Psychologist’s evidence of “catastrophic collapse” was accepted in full (at [38]), and the majority acknowledged this as the “most important consideration” in favour of consent (at [37]).

Vulnerability to exploitation. Evidence that the represented person is susceptible to suggestion, unable to recognise unsafe situations, and may acquiesce to sexual activity without genuine consent. This was accepted in AB (at [59]) but was insufficient without a corresponding finding of real risk.

Absence of alternatives. Evidence that the represented person is unable to use any available contraceptive measure independently. Where condoms are the only alternative and the represented person lacks the organisational capacity to use them, this factor is established (at [23]–[24]).

Anticipated change in supervision. If a move to a supported living facility or other change in living arrangements is planned, evidence that the represented person will be subject to less intensive supervision and correspondingly greater exposure to the risk of sexual activity. In AB, the anticipated move was “at least a few years away” (at [63]), which limited its weight.

Expressed wishes. Where the represented person has consistently expressed a wish not to have children, this is relevant, although not determinative where capacity to understand the implications is lacking (at [36]).

8.2 Arguments for the Respondent

Low probability of sexual activity. Evidence that the represented person has no understanding of sex, has expressed no desire for sexual relationships, and has not engaged in sexually motivated behaviour. The Tribunal in EW and AB held that without a real likelihood of sexual activity, sterilisation cannot be in the represented person’s best interests.

Effective supervision. Evidence that the current level of supervision effectively manages the risk and that sterilisation would not materially reduce that supervisory burden. In AB, the Tribunal found that AB required constant care in any event (at [75]–[76]).

Permanence and irreversibility. Emphasise that vasectomy is to be treated as permanent, even though reversal is technically possible but unreliable (at [20]–[21]). This engages the “step of last resort” principle.

Youth and potential for change. Where the represented person is young, argue that their circumstances may change and their views on children may evolve. In AB, the Tribunal noted that at 19, “we must assume that it is not impossible that he might” change his mind about children (at [35]).

Disentangling interests. Scrutinise whether the application is motivated in part by the guardian’s own interests, such as the burden of caring for a grandchild, financial concerns about claims on an estate, or anxiety about the represented person’s genetic conditions being inherited by a child (at [80], [86]–[89], [93]–[95]).

9. Key Takeaways for Legal Practice

1. The real prospect of sexual activity is the threshold question. Where the evidence does not establish a real prospect that the represented person will engage in sexual activity, sterilisation will not be found to be in their best interests, regardless of how severe the psychological consequences of parenthood might be (at [42], [78]; EW at [82]).

2. Severity of harm, standing alone, is insufficient. The majority’s reasoning establishes that the analysis requires both a risk assessment and a consequence assessment. A finding of catastrophic psychological harm from fatherhood is necessary but not sufficient; the probability of the triggering event must also be established (at [78]).

3. Sterilisation remains a step of last resort. The requirement of “compelling justification” from Marion’s Case is applied with full rigour. Even where no alternative contraceptive measures are available and the represented person’s expressed wishes appear to align with sterilisation, the Tribunal will not consent unless the overall constellation of factors supports it (at [97]).

4. Effective supervision may undercut the application. Paradoxically, evidence that the guardian is effectively managing the risk of sexual activity may demonstrate that sterilisation is unnecessary. Practitioners should be aware that presenting evidence of vigilant supervision, while demonstrating good care, may weaken the application (at [76]).

5. The represented person’s expressed wishes are relevant but not determinative. Where the represented person lacks the cognitive capacity to understand the implications of sterilisation or parenthood, their expressed preferences are taken into account but cannot determine the outcome (at [36]). Practitioners should not overstate the significance of expressed wishes.

6. Applications may be renewed on changed circumstances. The Tribunal expressly contemplated that a further application might be brought if circumstances change (at [98]). This indicates that a refusal is not necessarily final, and practitioners should advise guardians about the circumstances that may provide a stronger factual foundation for a future application.

7. The sexual assault pathway is of limited utility. A vasectomy does not protect against sexual assault itself. The Tribunal found that, in the context of sexual assault by a person with intellectual capacity, it was highly unlikely that the represented person would ever become aware of any resulting child (at [65]). This limits the usefulness of this concern as a basis for sterilisation.

8. Subsidiary concerns about family interests will be scrutinised. While the Tribunal accepted that AB’s parents were motivated by genuine concern for his welfare (at [79]), it separately analysed each subsidiary concern—estate claims, genetic conditions, parental stress—and found each insufficient. Practitioners should focus arguments on the represented person’s interests and avoid reliance on benefits that accrue primarily to family members.

9. The dissent signals an alternative approach. Dr Winterton’s dissent indicates that reasonable minds may differ on the weight to be given to low-probability but high-consequence risks. This divergence may be relevant on appeal or in future cases where the factual matrix falls between the clearly insufficient risk in AB and the clearly established risk in a case involving active sexual behaviour.

10. The ten-factor framework from JC is now established. The adoption by successive Full Tribunals of the ten-factor framework articulated in JC at [37] confirms its status as the standard analytical tool for sterilisation applications in Western Australia. Practitioners should structure their evidence and submissions around each of these factors.

10. Conclusion

AB [2026] WASAT 31 reinforces that the Tribunal will approach applications for consent to sterilisation with the rigour that the gravity of the decision demands. The case confirms that the best interests test under s 63 of the GA Act incorporates not only an assessment of the severity of harm that might follow from the represented person having a child, but also a threshold assessment of the real prospect of that event occurring.

For practitioners, the decision provides both a detailed analytical framework and a cautionary illustration. The fact that the majority was prepared to refuse consent—notwithstanding accepted evidence of catastrophic psychological harm, the absence of alternative contraceptive measures, the represented person’s own expressed wishes, and the good faith of the applicant—demonstrates the height of the bar that sterilisation applications must clear.

The dissenting opinion of Dr Winterton offers a defensible alternative analysis, grounded in the same factual findings but applying a lower threshold of risk tolerance. The divergence between the majority and the dissent is likely to be of particular interest in future cases where the factual matrix presents a closer question on the likelihood of sexual activity.

The core practical message is clear: practitioners advising guardians must carefully assess the real prospect of the represented person engaging in sexual activity before bringing an application. Where that prospect is low, the appropriate course may be to monitor the situation and document any change in circumstances that may provide the foundation for a renewed application at a later date.

 Note: All names used in this article are pseudonyms assigned by the Tribunal. The judgment was published under those pseudonyms in accordance with the State Administrative Tribunal’s standard practice in guardianship proceedings. No details in this article identify or are intended to identify any party, witness, or associated person.