The problem with his assertation that he is a police officer because he got training and certification is: he skips over the word "private", ie: employed by a corporation, and working in pursuit of their corporate business. Things like "employed" and "working" are foreign concepts to him, and without them, it makes him a private citizen. Technically, in employment stakes, he's a little up the ladder from mall cop or security guard, since his certification would allow him powers of arrest on behalf of his employer, which a mall cop doesn't have. He's also only allowed to take on such a job if he's not been convicted of a felony, otherwise his certification is just so much waste paper and really only useful as an emergency backup in the bathroom for when he runs out of tp (much like most of the rest of his accumulated "evidence").