Please tell me you're not really such an utter bonehead as to believe you can relate being accused of killing kittens to being asked for your birth certificate? The former is something a psychotic person does, the latter is something each and every natural born American citizen owns. The former question should be ignored, the latter question is legitimately asked to every American citizen at least several times or more during their lives. AND THEY ALL MUST PRODUCE THE DOCUMENT. Unless, of course, they don't have one and need lots of time to produce a good forgery. They also need lots of time to get their rump swabs to ask questions about kittens.