A federal judge in Ohio has denied a request by a former treasure hunter Tommy Thompson to change prisons because of an allergy to fiberglass.

During a ruling on Monday, U.S. District Court Judge Algenon Marbley in Columbus says Tommy Thompson has never been diagnosed or treated for sensitivity to fiberglass.

According to the Washington Post, Marbley also said that Thompson hasn’t provided any evidence there exists fiberglass in Michigan’s Milan federal prison or of a possible exposure risk.

Tommy Thompson has been held in contempt since December 2015 for violating terms of a plea deal after refusing to respond to questions about the location of 500 missing gold coins.

The coins were minted from gold taken from the S.S. Central America, which sank in an 1857 hurricane.

The treasure hunter doesn’t currently have an attorney.