Chemical castration for sexual offenders: Malaysia must focus on what actually prevents reoffending

Being tough on sexual offenders should mean being tough on reoffending, not merely tough on punishment, writes criminologist Datuk Dr P. Sundramoorthy.

The debate over chemical castration for sexual offenders in Malaysia deserves to move beyond the question of whether the punishment is sufficiently harsh.

My commentary in March argued that Malaysia should be cautious about introducing chemical castration as a general sentencing measure.

I remain of that view. However, the continuing public discussion following recent developments in Singapore provides an opportunity to examine a more important question: what combination of measures is most likely to prevent a sexual offender from reoffending and, ultimately, protect the next potential victim?

From a criminological perspective, this distinction is critical. Public anger towards sexual offences, particularly those involving children, is entirely understandable. Society has every right to demand strong punishment and effective protection. But criminal justice policy should not be designed primarily around the emotional appeal of a punishment. It should be judged by whether it actually reduces offending.

Chemical castration may have a role in carefully selected cases, particularly where a person’s sexual offending is strongly associated with persistent or compulsive sexual urges. Hormonal treatments can reduce sexual drive, and research has reported reductions in sexual thoughts and behaviours among some treated offenders.

However, systematic reviews have also highlighted the limitations of the existing evidence, particularly the lack of robust recidivism data and methodological weaknesses in many studies.

This is why the term “chemical castration” can itself be misleading. The intervention is not a simple mechanism for eliminating criminal behaviour. It is essentially a form of pharmacological suppression of sexual drive. Reducing sexual drive and reducing criminal propensity are not necessarily the same thing.

Sexual offending is a heterogeneous phenomenon. One offender may be driven substantially by compulsive sexual interests, while another may be motivated by power, control, hostility, distorted attitudes towards victims, opportunism, grooming, substance misuse or a combination of psychological and social factors. Lowering testosterone may therefore address one component of the problem while leaving other criminogenic factors untouched.

Research has found no overall difference in baseline testosterone levels between sex offenders and non-sex offenders, reinforcing the point that sexual offending cannot simply be reduced to a problem of testosterone or excessive sexual desire.

This distinction becomes particularly important when considering so-called “hardcore” or high-risk offenders. If the primary motivation is domination, violence, hostility or power rather than uncontrolled sexual urges, reducing libido may not substantially alter the individual’s propensity to harm another person.

The recent developments in Singapore offer Malaysia an instructive comparison. Singapore has introduced its Sentence for Enhanced Public Protection regime for serious violent and sexual offenders assessed to present a substantial risk of reoffending. The regime incorporates expert risk assessment, minimum custodial terms and continuing review of whether an offender remains a threat to the public.

At the same time, Singapore has specifically stated that it remains open to pharmacological anti-androgen treatment if there is clear evidence that it reduces crime, but that the evidence remains inconclusive. It has also retained a non-public system for screening people seeking roles involving sustained contact with children and young persons.

There is an important lesson here. Rather than asking whether Malaysia should simply introduce chemical castration, we should ask whether Malaysia has sufficiently developed the risk-management infrastructure necessary to identify which offenders require which interventions.

In my view, this should begin with structured and professionally informed risk assessment before release. Not every convicted sexual offender presents the same level of danger.

The seriousness of the original offence is important, but it should not be the sole indicator of future risk. Psychological assessment, previous offending, behavioural patterns, treatment response, victim characteristics and other established risk factors should inform release and supervision decisions.

Secondly, imprisonment should become more than a period of incapacitation. High-risk offenders should receive specialised interventions addressing distorted thinking, empathy deficits, impulse control, problematic sexual interests, attitudes towards victims and other relevant criminogenic factors.

Where clinically appropriate, pharmacological treatment could form one component of this broader programme rather than being treated as a substitute for it.

Thirdly, post-release supervision requires much greater attention. The period immediately following release can be critical. High-risk offenders may require structured supervision, counselling, treatment compliance, restrictions on certain activities or contacts where legally justified, and continuing professional risk assessment. The objective should be managed reintegration and public protection, not simply release followed by hope that the offender does not reoffend.

Malaysia also should consider strengthening its system for protecting children and other vulnerable persons from known high-risk offenders. A controlled, professionally administered screening mechanism for occupations involving sustained contact with children may deserve consideration.

However, an indiscriminate public register could create unintended consequences, including vigilantism, permanent social exclusion and reduced prospects for rehabilitation. Singapore’s approach of maintaining a non-public record accessible to selected agencies provides one possible model for discussion.

There is also an important medical and ethical dimension. Hormonal suppression is not without potential adverse effects.

Research has identified concerns including effects on bone density, metabolic health, mood and other aspects of physical and psychological wellbeing.

Any Malaysian framework would therefore require proper medical assessment, informed consent where applicable, judicial safeguards, continuing medical supervision and clear legal rules concerning treatment during and after imprisonment.

Most importantly, Malaysia should resist the temptation to turn chemical castration into a political symbol of being “tough on crime”. A severe-looking punishment is not necessarily an effective punishment.

The objective of contemporary criminology should be more ambitious: identify the offender’s risk, understand the causes of the offending, intervene appropriately, supervise effectively and prevent another victim.

If credible evidence eventually demonstrates that pharmacological suppression substantially reduces sexual reoffending among a clearly identified category of high-risk offenders, Malaysia should be prepared to consider it. But the evidence presently does not justify presenting it as a universal solution. Even research reporting promising results has emphasised the need for better-quality studies and stronger recidivism evidence.

The real measure of a successful criminal justice policy is therefore not how severe it appears to the public, but whether it makes the public safer.

Malaysia already has tough laws and severe penalties for sexual offences. The next stage should be to build a more sophisticated system of risk assessment, rehabilitation, clinical intervention, post-release supervision and victim protection.

If chemical suppression has a role, it should be within that system, not instead of it.

Ultimately, being tough on sexual offenders should mean being tough on reoffending, not merely tough on punishment. The strongest criminal justice response is the one that gives society the greatest likelihood that there will not be another victim.

The views expressed here are the personal opinion of the writer and do not represent that of Twentytwo13.