It wasn't his accent. It was his poor use of language and saying like a bit of weed was no biggie yet continuing to search because he knew the weed was leading to other things. When I am at work I wouldn't say "man" at the end of all my sentences and use improper grammar would you? Even if that's the way I talk at home I wouldn't when I'm at work dealing with the public.
Did you not find the cops language less than sincere because while I'm no inner city person, the flags were going off straight away that the cop was suspicious.