Botched (wrong address or wrong person) raids or raids where it appears excessive force has been used are certainly not a new phenomenon, as journalist Radley Balko documented in his 2006 study, "Overkill: The Rise of Paramilitary Policing in America." But most raids gone bad do not get such wide public or media attention.

The victims often are poor, or non-white, or both. Or -- worse yet -- they are criminal suspects, who generally generate little sympathy, even when they are abused.

And while they were originally created to handle very special problems -- terrorist incidents, hostage situations, and the like -- there just aren't that many of those. As a result the use of SWAT has seen "mission creep," where SWAT teams are now routinely called out to serve search warrants, particularly in drug cases. In 1980, 2,884 SWAT deployments were recorded nationwide; the number today is estimated by experts at 50,000 annually or more.

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