The Society states that it is not necessary for both witnesses to have observed the same instance of child molestation to establish guilt. Since 1991, statements by two victims of separate incidents by the same perpetrator may be deemed sufficient to take action and impose internal sanctions. However, critics argue that such an approach to determining guilt overlooks the seriousness of the initial abuse, and effectively allows a pedophile to go unpunished until he or she has been caught abusing two or more different victims. DNA evidence, medical reports, or information from forensic experts or police that proves sexual abuse may possibly be accepted as a valid "second witness", however critics argue that, without mandatory reporting for all accusations of abuse regardless of the local laws, such evidence could remain undetected.