It takes a relatively short amount of time, and a few fairly well understood psychological techniques, to implant memories in people.
The science is basically in: Your memory is not a camera that faithfully records your experiences in the world and plays them back to you later. It’s constantly re-interpreting and re-writing itself, and can easily be fooled into taking on board fictitious details, treating them just the same as all the memories that originated from actual experiences.
People Can Be Convinced They Committed a Crime That Never Happened, as one headline puts it.
So, the next time we hear about someone confessing to a crime, and it turns out they were interrogated for eight hours by police first, using techniques known to elicit both false memories and false accusations, can we agree in advance that this confession means nothing, and that we don’t actually have to pay a damn bit of attention to their own opinion on what they did, and that we can thank the cops for screwing up the evidence if we’re unable to bring a case against anyone as a result?