I am open to suggestions, legal ones.
Wait until he sleeps and do the same to him, only louder.
Not really the best site for legal advice, especially when it's not sex related.
Fuck his wife
Fuck his wife, leave/move and keep fucking his wife.
Seriously though you could report the noise. Are there also other neighbors who are just as annoyed with the situation? If so, you could report this to his captain or chief. I am also most certain there is some standard of behavior for police officers which this does not comply. It might also be in violation of local noise ordinances.
No joke. Worked within Police Dept in days past. Go to the Police Station and request to talk to the supervising officer. Be calm and rational but firm about the problem.
When you get to work call him every half hour on the phone