Police are out-of-control. They are conditioned to think of themselves as different from the general population, and to think of citizens as "the enemy."
Where I live, every bit of drug evidence was stolen by policeman in late 2007. Cops and their families put square, black stickers with a horizontal bar of blue in the middle on their cars so that other cops won't bother them.
One cop was dealing drugs to my neighbor who is a fireman while my neighbor was suspended for molesting my 11-year-old retarded brother with William's Syndrome about two years ago. When my family had an electrical fire in my house, my neighbors friends in the Fire and Police Departments tried to frame my other younger brother with arson. I think that alone is enough reason to distrust policemen.
What really made me distrust policemen was a few years ago, a man pulled out of a fastfood drive-thru the wrong way. A police car started chasing him down the highway. They struck and killed a pregnant woman whose car broke down on the side of the rode. The cop effectively committed a hit-and-run murder because a man came out of a drive-thru the wrong way.
Then, I keep discovering innocent people murdered by policemen. Men, women and children tasered to death, killed by "nonlethal" bean-bag or tear-gas guns, run down by speeding police cars, or shot.
It is a well-known fact in my city that the policemen lie to and intimidate residents. They take advantage of immigrants or ignorant minorities. Policemen will lie to these people, telling them that they have to consent to searches when they do not, or that they have to answer questions when they do not. One of their favorite tricks is to tell someone that they have a warrant, and then search areas not covered in the warrant or seize property not described in the warrant.
Police are a necessary evil. I am disgusted by the corruption and uncontrolled violence displayed by the police. There should be more restraint and more oversight in law enforcement.