Aha..aha..Correct..Correct.. whoa!!

In a court of law, can a witness or a person charged, claim to forget or ignorance? The police or the persecuting party I'm sure have done their groundwork, investigations or whatever before hand. With evidence laid, the presiding judge I'm sure will make whatever decision in the name of justice. Does this apply to a Royal Commission too ? We have last week witnesses who are ignorance happy and amnesia happy. What can the Royal Commission do ? Are they tied by some terms of reference. I'm sure whatever terms of reference exist , isn't it truth they are seeking ? And what about the messenger, is he going to be shot again and again. When will he be heard ? That ` aha .. aha.. correct..correct...correct.." video in You Tube really can't stop banging in my mind...aha..aha.. correct..correct.. there it goes again