Good grammar skills are not necessary to do good police work. Neither you nor I have any real way of knowing, based on the sniper case, what kind of police officer Moose is. Most of the details of this case are being kept under wraps, so it's impossible to judge him based on the unknown.
He was fired from liberal Portland for poor conduct. I think that is evidence of his record.
I swear, some of the comments on these threads remind me of the DUnderhead sneers at Dubya's tongue-twists. Many highly intelligent people sound dumb when speaking in public.