(Denny Crane: "I Don't Want To Socialize With A Pinko Liberal Democrat Commie. Say What You Like About Republicans. We Stick To Our Convictions. Even When We Know We're Dead Wrong.")
The fault lies with one officer. The one who petitioned the court for a search warrant. He is typically the same one who leades the raid so he/she is at fault. Very shotty investigative work. Probably got a tip from an informant and did not follow-up. I disagree in suing the whole department.
Mistakes are made but the police are right 99% of the time. You only hear about the 1 out of 100 incidents that they are wrong. Officer in charge should be reassigned or off without pay in the least or a more significant punishment if local, and I repeat local, senitment dictates.
Won't do any good to sue them. If the people win, the politicians will only raise their taxes to pay the award[plus a little for their own pockets].