Having been groped on a crowded train, it can be extremely difficult to identify whose hand is responsible. Sure, if they put their hands down your pants, you

Having been groped on a crowded train, it can be extremely difficult to identify whose hand is responsible. Sure, if they put their hands down your pants, you have a chance to capture their wrist. But if you aren't in physical contact with the person, it's just a sea of anonymous faces when you turn around to confront your assailant.