WHITE PLAINS, N.Y. (AP) _ A tip from a viewer of a television show that profiles wanted criminals has led to the arrest of a man who allegedly posed as a policeman and helped con $12,200 from an elderly woman, police said.

Leroy Carter, 56, of Chicago, also was wanted in Pennsylvania and New Jersey in similar scams, according to Sgt. Vincent Paterno.

Carter allegedly was one of a group of con artists who told a White Plains woman, whose name was not released, that they were police officers. In the con, which took place sometime in early April, they persuaded the woman to entrust her money to them.

Carter had been profiled on Fox Broadcasting's ''America's Most Wanted'' program on April 3. That segment was to be repeated this Saturday, and a promotional spot for the rerun was seen by a viewer in the New York City area, who called the program's toll-free number Wednesday and said he had seen Carter in the Harlem section of Manhattan, said Jack Breslin, a publicist for Fox Broadcasting in Los Angeles.

Acting on the tip, police from this New York City suburb tracked down Carter and arrested him Thursday in Harlem.

He was charged with third-degree grand larceny and first-degree crimimal impersonation and was being held pending arraignment.

The April 3 program detailed a scam against a Chicago woman who lost her life's savings to a con man identified as Carter.

The White Plains con took place soon after the broadcast. Police were tipped then by someone who saw the show and recognized Carter, and the White Plains victim identified Carter as the perpetrator.

Breslin said 82 subjects have been profiled on ''America's Most Wanted'' since the program began Feb. 7, and viewer tips have led to the arrests of 19 people.