I remember as I jumped up into the vent above ABS's spot in nancy thinking "Man, booj is screwed. They will find him right away." How wrong was I, apparently hiding in plain sight works wonders.
I screwed up my own best spot on top of The Pit, in that dark alcove with the one big crate. A lerk landed on top of the box and looked down. Thinking I was dead, I jumped up and started knifing. Turns out he hadn't seen me. Oops.