"He said that Koistinen never saw Dang because the bicycle had no reflectors or lights on it."
Even if the officer wasn't drunk, how was he supposed to see the guy? Even on my bike I only see light-less folks about 100 or so feet away, maybe. Not enough time to do much when in a car. The officer should definitely be tested, but the cyclist definitely takes some of the blame.
Unless, of course there were lights and reflectors on the bike. Don't be surprised to learn that not all statements by cops about cops are fully truthful or that evidence against cops isn't sometimes 'altered' to cover up cop misbehavior. Yes, I don't trust cops.