Why rape cases should not be subject to reasonable doubt

Is it better to have the harm of 100 sexual assaults than the harm of one false conviction?

Conviction rates for sexual assault against women are shockingly low, to the extent that, even in a developed nation such as the United Kingdom, only 6 per cent of rape allegations result in a conviction, a far lower rate than for any other violent crime. As The Guardian columnist Julia Bindel puts it, ‘rape might as well be legal’.


Disturbingly low conviction rates have many explanations, but one contributing factor is the ‘beyond a reasonable doubt’ standard of evidence employed in criminal cases. This standard requires that the jury not have any reasonable doubts about the defendant’s guilt in order to convict. Doubts they have that are frivolous or hypothetical should be put aside.

Unfortunately, this standard contributes to a low conviction rate in cases of sexual assault, which is often physically indistinguishable from consensual sex. This means that a verdict can hinge solely on testimony. When two people tell stories convincingly, each story casts some reasonable doubt on the other.

The standard is also incorrectly applied due to the prevalence of rape myths ­– prejudicial, stereotyped or false beliefs about rape, rape victims and rape perpetrators. These myths involve blaming the victim and sympathising with the perpetrator, along with the common belief that women, motivated by jealousy, revenge or spite, falsely claim rape after consensual sex.

‘Testimonial injustice’, a concept developed by the feminist theorist Miranda Fricker at the University of Sheffield, is a systematic, insidious tendency to unjustifiably and often unintentionally downgrade the credibility of women’s testimony. Testimonial injustice and rape myths function together to render unreasonable doubts reasonable in the minds of judges and juries. Even judges can buy into the most egregious stereotypes about women’s sexual behaviour.

Part of the response to this dire situation is surely better prevention of sexual violence against women, as well as raising awareness of deep-seated social prejudices. However, we should also question what justifies the reasonable doubt standard in the first place, and whether it has been unduly stretched in the case of sexual assault. The 18th-century jurist Sir William Blackstone provides perhaps the best-known statement of the rationale behind the reasonable doubt standard. Blackstone argued: ‘It is better that 10 guilty persons escape than that one innocent should suffer.’ A strong intuition seems to undergird this proclamation: the harms of false conviction are so severe that the legal standard of evidence should drastically reduce the likelihood of it occurring.

For the falsely accused, these harms can indeed be severe. They include stigma, broken relationships, violent victimisation in prison, lost income, an increased likelihood of committing crimes, and greater difficulty in finding employment after release. On the face of it, it seems as though the potential to inflict such harms on an innocent person justifies an extremely high standard of evidence like the reasonable doubt standard.

This move is too quick though, since it neglects the harms of false acquittal. In considering whether or not a standard of proof is justified, we should consider not just the harm done to the one man wrongly convicted, but also the harm done by the 10 men wrongly released. This means that the justification for a standard of proof should also consider the accrued harms of false acquittal to the initial victim, to future victims of those criminals and to society.

In the case of sexual assault, these harms are extraordinarily severe. The victim suffers horrendously through the trial and is often badgered into reliving disturbing details of the incident. When the false acquittal is reached, all this is for nothing. Worse than this, she is falsely branded a liar, with all the psychological trauma this entails.

The harms of false acquittal to future victims and their loved ones amplify and extend this harm. Indeed it has been suggested that the trauma of sexual assault is greater than that experienced by war veterans.

Moreover, sexual offenders are likely to offend multiple times. In one study, rapists self-reported an average of 10 violent crimes, even before their ‘careers’ had ended. Consequently, to paraphrase Blackstone’s ratio with reference to sexual violence would mean saying it’s better to have the harm of 100 sexual assaults than the harm of one false conviction – a conclusion that is untenable.

All this is without consideration of the social harm of false acquittal. One is that false acquittals contribute to a vicious circle: a lower chance of conviction leads to a lower likelihood of reporting. Lower reporting again reduces the chance of conviction and so on. Given this circle, it is perhaps unsurprising that in the UK it is estimated that between 75 per cent and 95 per cent of rapes are never even reported. Those that are reported are often not investigated or prosecuted because of the low chances of conviction.

A vicious circle operates in another respect, too: false acquittals reinforce rape myths. When a man is found not guilty on the basis of reasonable doubt, this creates the impression, wrongly, that he was in fact innocent and the accuser was a liar. The large number of acquittals in rape cases thus serves to strengthen and reinforce utterly unfounded rape myths that women are vindictive and frequently lie about having given consent. Again, these myths feed into the social imagination, prejudicing judges and juries, and further lowering the likelihood of conviction.

As it stands, the legal system is weighted unfairly in favour of perpetrators of sexual assault. In addition to sending out a powerful expression of intolerance for gender violence, a lower standard of proof can decrease these harms by reducing the likelihood of false acquittal. Reasonable doubt is inappropriate, but what standard would do better?

Of the standards commonly employed in law, only the ‘preponderance of the evidence’ standard has been used on a consistent basis to decide cases of sexual violence, albeit in civil trials. Indeed, given the high probability of false acquittal, civil trials have increasingly become a first port of call for female victims of sexual violence in the US. Rather than calling for the absence of doubt, this standard judges a case on what the evidence leads one to believe most strongly. If a woman’s testimony provides a stronger reason to believe that she did not give consent, this should be enough.

Christopher Wareham & James Vos

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This article was originally published at Aeon and has been republished under Creative Commons.

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The study's senior author and Integrative Physiology Professor Christopher Lowry described this fat as "one of the main ingredients" in the "special sauce" that causes the beneficial effects of the bacterium.

The finding goes hand in hand with the "hygiene hypothesis," initially proposed in 1989 by the British scientist David Strachan. He maintained that our generally sterile modern world prevents children from being exposed to certain microorganisms, resulting in compromised immune systems and greater incidences of asthma and allergies.

Contemporary research fine-tuned the hypothesis, finding that not interacting with so-called "old friends" or helpful microbes in the soil and the environment, rather than the ones that cause illnesses, is what's detrimental. In particular, our mental health could be at stake.

"The idea is that as humans have moved away from farms and an agricultural or hunter-gatherer existence into cities, we have lost contact with organisms that served to regulate our immune system and suppress inappropriate inflammation," explained Lowry. "That has put us at higher risk for inflammatory disease and stress-related psychiatric disorders."

University of Colorado Boulder

Christopher Lowry

This is not the first study on the subject from Lowry, who published previous work showing the connection between being exposed to healthy bacteria and mental health. He found that being raised with animals and dust in a rural environment helps children develop more stress-proof immune systems. Such kids were also likely to be less at risk for mental illnesses than people living in the city without pets.

Lowry's other work also pointed out that the soil-based bacterium Mycobacterium vaccae acts like an antidepressant when injected into rodents. It alters their behavior and has lasting anti-inflammatory effects on the brain, according to the press release from the University of Colorado Boulder. Prolonged inflammation can lead to such stress-related disorders as PTSD.

The new study from Lowry and his team identified why that worked by pinpointing the specific fatty acid responsible. They showed that when the 10(Z)-hexadecenoic acid gets into cells, it works like a lock, attaching itself to the peroxisome proliferator-activated receptor (PPAR). This allows it to block a number of key pathways responsible for inflammation. Pre-treating the cells with the acid (or lipid) made them withstand inflammation better.

Lowry thinks this understanding can lead to creating a "stress vaccine" that can be given to people in high-stress jobs, like first responders or soldiers. The vaccine can prevent the psychological effects of stress.

What's more, this friendly bacterium is not the only potentially helpful organism we can find in soil.

"This is just one strain of one species of one type of bacterium that is found in the soil but there are millions of other strains in soils," said Lowry. "We are just beginning to see the tip of the iceberg in terms of identifying the mechanisms through which they have evolved to keep us healthy. It should inspire awe in all of us."

Check out the study published in the journal Psychopharmacology.