Joanna,
The research on this is clear: people can easily develop vivid and detailed memories about life events that have never happened if they are repeatedly questioned about the possible event. If you ask "Did your mom touch you in a bad way?" enough times in therapy, some people will develop a vivid, detailed, yet fabricated memory that mom did abuse them. As Yosh points out, we should not accept claims of rape or abuse that happened many years ago simply because the person vividly remembers the event.
And I know Yosh can defend her own position, but she isn't talking about sexual abuse; she's talking about claims of sexual abuse. Again, having a vivid and detailed childhood memory of abuse is not clear evidence that the abuse occurred. I know it would be easy if we could just accept the person's account, but memory processes are not that simple. (And that leads back to my point in my previous post.)
Miles