Facial expressions and gestures can impact the outcome of a trial that depends on the credibility of witnesses.
Most people on juries assume suspects only confess when they are guilty, and the consequences can be disastrous.
The European Court of Human Rights has rejected a call to reconsider whether interrogation techniques used in the 1970s against men interned in Northern Ireland amounted to torture.
Psychologists have developed evidence-based interrogation methods that could be used as alternatives to torture.
Innocent people do confess to terrible crimes they had nothing to do with. Psychologists are investigating factors that contribute to false confession – including how well-rested a suspect feels.