NASHVILLE, Tenn. (AP) – An ex-Tennessee teacher who fled the state last year with a 15-year-old student has pleaded guilty to federal charges. Tad Cummins pleaded guilty Thursday to obstruction of justice and crossing state lines to have sex with a minor. The 51-year-old Cummins disappeared with the girl last March. The two were found in April at a remote forest cabin near Cecilville,in Siskiyou County, following a tip to police. Although their absence sparked a 39-day nationwide manhunt, the girl was found safe.