PARIS — A registered sex offender admitted Tuesday to violating his probation by volunteering on a school-sponsored bus trip in September.

Rodney A. Heath, 38, of 970 Gore Road in Otisfield, who also goes by the name of Rodney Shackley, was charged with prohibited contact with a minor after attending a field trip organized by the Oxford Hills Technical School in Paris.

A hearing on whether his probation will be revoked was continued to Dec. 14 in Oxford County Superior Court.

The director of Oxford Hills Technical School, Shawn Lambert, said the field trip was a weekend volunteer event, and students were invited to bring family members. Heath was a relative of one of the students and helped students in a cleanup project in Fryeburg. Lambert said the school does background checks for volunteers on official school trips.

Student journalists interviewed Heath and took his picture for a story published in the Advertiser-Democrat, although Heath declined to give the reporter his last name. According to the Advertiser-Democrat, Heath’s parole officer, Wayne Sturdivant, recognized him in the photos.

Heath, a tattoo artist, was convicted of unlawful sexual conduct, aggravated criminal trespass and domestic assault in 2007 and sentenced to eight years, with all but five suspended, and three years of probation.

In 2008, while serving time at the Maine State Prison, Heath pleaded no contest to a charge of sexually assaulting a 13-year-old girl. He was sentenced to one year, to be served concurrently with his previous sentence. He is a lifetime registrant on the state sex offender registry.