I will be impressed if anyone can come up with a plausible reason they would do this (and their superiors would support them), other than the following:
The US Department of Justice is responsible for investigating and prosecuting cases of police corruption nationwide. If you are concerned about police corruption in your town, you can write to email@example.com for help.
Massachusetts' own attorney general is, unfortunately, Martha Coakley, who consistently shows herself to be an opponent of transparency in government. She supports police and DAs even when they are dishonest and corrupt, rather than standing up for the rights of the citizens of the commonwealth as her duty requires.
On Tuesday, January 19th, she will be standing for election as a Democrat for the Senate seat held by the late Ted Kennedy. The election is fairly close, and the Senate seat is important to the health care fight, but I cannot stomach voting for Ms. Coakley.