False memory
Sometimes, people are accused of a crime, and often part of the evidence consists of facts other people remember. It is a problem to convict someone of a crime, based only on such evidence. In the case of sexual abuse or of child abuse these memories will usually be bad ones, and the brain will have changed them, as a measure of protection. Before a conviction is done, the court needs to make sure that the conviction does not happen based on the recollection of only one person, as recovering the "facts" behind the memories can be difficult.