Forrest William Johnson (Jail photo/Texas attorney general's office)

AUSTIN (February 15, 2013)--A federal agent arrested in Central Texas for using the Internet to arrange a sexual tryst with an underage girl was free on bond Friday

The attorney general's office announced Friday that Forrest William Johnson, 50, of Austin, was charged with a felony count of online solicitation of a minor.

Johnson worked in law enforcement for U.S. Customs and Border Protection at Austin-Bergstrom International Airport.

Johnson, who’s accused of posting an explicit online advertisement, was contacted by an undercover officer posing as a 15-year-old girl and was arrested Wednesday after he arrived for the encounter, authorities said.

Johnson was taken to the Williamson County Jail, from which he was released Thursday after posting $20,000 bond.