While there are U.S. police forces that
may be corrupt, they don't seem to be bribe-able. When the police start accepting bribes from the public (ordinary citizens,) the undermine the trust and belief that the public has in them; when they re-sell confiscated drugs, they are already dealing with the criminal element (those who would buy drugs)--not the public at large.
Spousal abuse, while not limited to cops, does seem to be prevalent amongst those who like to have power over others, which police certainly do, and is only helped by the fact that they have access to weapons.
I'm going to have to go with Zhinghur on this one; when cops break the law they tend to do so in concert with already established criminal elements or past times such as the Mafia, drug lords, weapons smuggling, drug dealing etc. and not by accepting bribes from 'John Q. Public' to avoid speeding tickets.
Not only is the money not that great if one accepts bribes, but it also increases the likelihood of being 'found out.' Dealing in illegal substances would give you a ready-made audience used to breaking the law, and not talking about it.
Cheers.
. Anyways cheers 
After moving to Florida my feelings for the police changed. Police don't have much hesitation to use their gun down here. There are also many stories in the local paper about police getting busted for reselling confiscated drugs, shooting their spouse, etc. In an apartment complex that I lived in Tampa, a resident that I met and was studying to pass the police exam was busted for selling coke. It is unfortunate to see.