Crime confession

When a crime suspect confesses most people and even most investigators would assume that they are guilty.
In reality an innocent person confessing to crimes such as rape or murder happens more often than intuitively seems possible.
At fault are usually the tactics of investigators. The suspect is told that the evidence has already been collected and that the police knows they are guilty. The interrogation can last for 10 hours, during which the suspect will start to question themselves, additionally they are sometimes told that it is possible they just repressed their memories of the crime. This memory repression isn't actually possible and their simply manipulated into believing they unknowingly did it.