I'm thinking since the people he was killing were shady folks, the people he was hired by took care of prints.
When Foster was getting his ass kicked by that homo dude, I thought it was stupid he left his blood all over that house and didn't burn the place down or anything. There was evidence EVERYWHERE. lol
It was cool for an action film. It did absolutely nothing for action films in the way of originality, though. I'm ready for a change.