A Vancouver Public Schools teacher who had federal child pornography charges dropped against him Monday will not be returning to the school district.

Jay Michaud, who was a teacher on special assignment in the district’s administrative offices, retired effective Sept. 30, 2015, and surrendered his teaching certificate Jan. 18, according to Pat Nuzzo, the district’s communications director.

As part of the surrender, Michaud also signed an agreement stating that he wouldn’t seek recertification in Washington or other states, said Nathan Olson, a spokesman for the Office of the Superintendent of Public Instruction.

Michaud was arrested in July 2015 for allegedly downloading child pornography from a hidden website, called Playpen, operated on Tor — a network that provides user anonymity by routing communications through numerous computers around the world.

Federal prosecutors decided to drop the charges after the U.S. Justice Department refused to disclose classified information about the hacking techniques used to gather evidence against Michaud.