Cummins' wife also spoke out, hoping to reach her husband, to encourage him to turn himself in.
As reported by ABC News, Tad Cummins taught health science classes at Culleoka Unit School - where Elizabeth was a student.
The teenager went missing Monday from Columbia and is believed to be with 50-year-old Tad Cummins, CBS affiliate WTVF reports.
As stated in the Tennessee Bureau of Investigation's third Amber Alert update."Nothing investigators have learned about Cummins or his intentions for the young girl since issuing the AMBER Alert calms the imminent concern for Elizabeth's well-being".
A lawyer for the Thomas family described Cummins as "obviously a man who is not in control of his faculties".
It was January 23 when one of Elizabeth's schoolmates reported that as she was walking into Cummins' classroom she saw Elizabeth and Cummins kissing, according to a January 30 school district investigative report.
A friend dropped off the teen Monday at a restaurant in Columbia, Tennessee, near the high school, law enforcement authorities said; the restaurant is about 45 miles south of Nashville. Cummins has been charged with sexual misconduct with a minor, and is believed to be in possession of two handguns and a recent loan which gave him $4,500 in cash.
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"Tad, this is not you". Cummins was not Thomas' teacher, and the history of their relationship is unknown, TBI Private Investigative Officer Josh Devine said.
Elizabeth is one of ten children, and her mother is now facing five counts of child abuse.
"I guess the correct term is that he more or less overbore her will".
Her former teacher, Tad Cummins, 50, is allegedly shown on surveillance footage from a gas station near the restaurant at about 8:30 a.m. filling up his silver Nissan Rogue, the vehicle in which authorities believe he is traveling in with the teenager. "This is a 15-year-old child who has led a hard life", said Josh Devine with the Tennessee Bureau of Investigation.
"You just hope that you're going to find her alive".
Cummins is 6 feet tall and 200 pounds.
One week after his 15-year-old sister was last seen, Elizabeth Thomas' brother is urging the public to continuing sharing her photograph in an effort to bring her home. "As a family, we are focused on one thing and one thing only ― Elizabeth's safe and quick return".