Elizabeth Thomas has been missing for more than a week.
The Tennessee Bureau of Investigation said they had received 450 tips, but no confirmed sightings, which makes investigators think he is purposely keeping Thomas out of the public eye.
But to date, the leads called in have not panned out.
Footage of Tad Cummins, a 50-year-old United States high school teacher, quietly pushing a trolley around his local supermarket should have ordinarily given no reason for concern.
The incident was reported to the school the next day, he said.
Thomas family attorney Jason Whatley told ABC News that Cummins was "taking advantage" of his student and "manipulating her into leaving with him". "We continue to cooperate with law enforcement in the sharing of all pertinent information while the search continues".
"She certainly did not have my permission to get into a auto", he continues.
Police believe a box of woman's hair dye in the trolley showed that Cummins was plotting the abduction of Elizabeth Thomas days before she disappeared.
"A very manipulative child predator".
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Investigators also tell CBS News that Cummins appears to have been planning this for some time by watching survivalist shows.
The photo was captured in January, just days before Cummins' alleged inappropriate contact with Thomas, TBI announced. Cummins has denied the claim, but almost two months before Elizabeth and her former teacher went missing, one of Elizabeth's schoolmates reported seeing the pair kissing in Cummins classroom, according to a January 30 school district investigative report.
They vanished on March 13, weeks after another student reported seeing the two kissing. The sheriff's office indicated the case is under investigation, and the report was denied. We don't know that, but of course it might have made a difference.
Whatley told HLN on Monday: "Our focus is absolutely on getting Elizabeth back". Your family wants their poppy back. The complaint stated, "It wasn't like a makeout kiss, just a peck on the lips". "As a family, we are focused on one thing and one thing only ― Elizabeth's safe and quick return".
Thomas is 5 feet 5 inches tall and weighs 120 pounds, and she was last seen wearing a flannel shirt and black leggings.
"Because that's going to be what finally brings her home is somebody being able to see her that may have not had a chance to see her before", James Thomas said.
Cummins is 6-feet-tall and weighs 200 pounds with brown hair and eyes.
Cummins and Thomas are believed to be traveling in a silver Nissan Rogue with Tennessee tag 976-ZPT.
Cummins was added to Tennessee's most wanted list last week and has been charged with aggravated kidnapping and sexual contact with a minor. A $1,000 reward is available for information leading to Cummins' arrest.