Police said 28-year-old Joseph Gallagher, of Smithtown, engaged in sexual contact with an underage girl while he was working as a teacher at Bethpage High School in Nassau County.
The school contacted police after being notified of a possible incident.
Gallagher was charged with two counts of sexual abuse in the third degree and endangering the welfare of a child. He was arraigned Friday.
Detectives are urging any other possible victims to come forward and contact Nassau County Crime Stoppers at 1-800-244-TIPS or Special Victims Squad at (516) 573-4022.
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