Overkill: The Rise of Paramilitary Police Raids in America

Radley Balko has written a paper about paramilitary police raids in the United States.

http://www.cato.org/pub_display.php?pub_id=6476


These increasingly frequent raids, 40,000 per year by one estimate, are needlessly subjecting nonviolent drug offenders, bystanders, and wrongly targeted civilians to the terror of having their homes invaded while they’re sleeping, usually by teams of heavily armed paramilitary units dressed not as police officers but as soldiers.

See also this interactive map.