Tad Cummins is accused of luring Elizabeth Thomas into his vehicle outside of a restaurant in Columbia, Tennessee and disappearing with the girl on 13 March, investigators said on Saturday.
Cummins is wanted on allegations of aggravated kidnapped and sexual contact with a minor.
DeVine said that investigators believe that Cummins is keeping Elizabeth Thomas, 15, out of sight and the pair could literally be anywhere at this point. She was last seen wearing a flannel shirt and black leggings, authorities said. He is a white male, six feet tall, weighing approximately 200 pounds.
Thomas was picked up from her home the morning of March 13 by a female friend, investigators say, and was last seen at 7:45 a.m.at the Shoney's. "In fact, it only heightens it", investigators said.
Another student allegedly saw Cummins kissing Thomas in January, according to a letter written to the Maury County School District by Thomas family attorney, Jason Whatley.
Cooper charged Tad Cummins this week for a sexual interaction between him and a student, Elizabeth Thomas, at his school.
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Fifteen-year-old Elizabeth Thomas has been missing for almost a week.
To date, about 450 tips have poured in to the TBI, but they have produced no credible sightings or information on their whereabouts, leading authorities to believe Cummins could have Thomas hidden from the general public or far away from Tennessee.
Cryptic messages appeared on both Thomas and Cummins' Instagram accounts the day they disappeared.
About 100 people gathered at Riverwalk Park for a candlelight vigil Saturday night in honor of Elizabeth Thomas, who is at the center of a statewide Amber Alert.
Cummins' wife, Jill, pleaded with him to return Elizabeth safely. "Please do the right thing, and turn yourself into the police and bring Elizabeth home".
Police have described Thomas as five feet, five inches tall, 120 pounds, with blonde hair and hazel eyes. "One day you will find someone who can't imagine living their life without you".
Thomas and Cummins were last seen in a silver, 2015 Nissan rogue, with Tennessee tag: 976ZPT. "I urge Mr. Cummins to pick up that phone and call someone. and let us know where you are so you can start dealing with the consequences".