The entire philosophy behind SWAT-style drug raids is that the death of a mother, a child, or the family pet is an acceptable risk to prevent flushing.
Drug War Victims
When a government uses military personnel, equipment, and tactics against its own citizens, is it time to call it a Civil War rather than a Drug War?
Blessed are the Peacemakers
Overkill: The Rise of Paramilitary Police Raids in America white paper by Radley Balko