The Justice Department has until 4:30 p.m. Thursday to prove a man arrested in Salt Lake City Saturday is really Leonardo Contreras Subias, a suspect in the torture murder of a federal drug agent operating in Mexico three years ago.

The man was arrested in a Salt Lake restaurant Saturday on a 1980 warrant charging Subias with conspiracy to distribute a narcotic and failure to appear for a hearing. Subias is also wanted for questioning in the kidnapping and murder of drug agent Enrique Camerena, who was killed in Guadalajara, Mexico.The arrested man told U.S. Magistrate Ronald N. Boyce he is not Subias, and he gave a Spanish name as identification. Boyce set a hearing for 4:30 p.m. April 7 in which the government will have to try to prove the man is the 42-year-old Subias.

Steve Lough, U.S. Drug Enforcement Administration special agent, said Monday that as far as he knows, the man was just passing through Salt Lake City. However, the arrested man had a hotel room in the city.