I don't think there's a random cop in the game. There'd at least be a BM warning if such was the case. FoE's been on my scumlist and others have tried to vote him yesterday too. I don't see why we can't test Kestegs' results.
I wonder though why, Kestegs, did you announce you were going to claim. Thereby exposing yourself to get killed before then claiming cop with a guilty. Why not just say nothing? You were under suspicion already so you weren't top NK choice anyway..