NPR's Amy Costello reports on the use of stun guns -- devices that deliver a strong electric shock -- in law enforcement. In 1994, a research branch of the U.S. Justice Department offered 900 stun guns to the Maricopa County, Arizona sheriff's department, to study whether the weapons would reduce violence between prisoners and officials. The sheriff swiftly put them into use by prison guards. Only a year later, the Justice Department proper was investigating charges of abuse of inmates by guards using the weapons.
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