By Associated Press, Updated: Thursday, March 22, 7:16 AM

ALLENTOWN, Pa. — Neighborhood watch groups were designed to be the eyes and ears of police — passively observing what they see and reporting back to law enforcement — not to enforce the law themselves.
Most neighborhood watches follow the rules, and confrontations are rare. But after the killing of unarmed black teenager Trayvon Martin in a Florida gated community, criminal justice experts say police departments and watch groups need to make sure volunteers do not take matters into their own hands.
“First thing: You do not engage. Once you see anything, a suspicious activity, you call the number that the police department has given you,” said Chris Tutko, director of the Neighborhood Watch program at the National Sheriffs’ Association, which launched the neighborhood watch concept 40 years ago as a response to rising crime.
Tutko said he was flabbergasted to learn about a watch captain’s shooting of the 17-year-old Martin last month in Sanford, Fla. Civil rights groups have demanded the arrest of the captain, George Zimmerman, who has said he shot Martin in self-defense. The Justice Department has opened a civil rights investigation.
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