Can Stockholm syndrome be proven? Has it ever been used as evidence in court?

Patty Hearst unsuccessfully tried to use this as her defence for a bank robbery commited while being held hostage by the SLA. It was credible enough to be admisable but it just didn't convince anyone. a href="http://en.wikipedia.org/wiki/Stockholm_syndrome" rel="nofollow"http://en.wikipedia.org/wiki/Stockholm_s…/a