dirty cop

A corrupt or unethical police officer, such as one who accepts bribes, falsifies reports, or abuses the power of their authority for personal gain. There are so many dirty cops in this town that the police are now more dangerous than the criminals. With a number of dirty cops on their payroll, the mafia organization has been eluding prosecution for years. I refuse to have dirty cops on my force. If you're not an upstanding citizen, you have to go.