I doubt they would be willing to admit to a mistake ever and I would expect it to be very difficult to be compensated for any damages incidental to the warranted search. No warrant would be different. If falsely imprisoned you can get compensated. If he has stuff stolen he should report that and focus on that. In my view the raid was probably clean. I had a pit bull attack me and my dog the other day and if I could I would have dropped it but managed to stomp it some and it went away, twisted my ankle though.