Tad Cummins appeared in a federal courtroom in Nashville on Tuesday to face an additional charge of bringing a minor across state lines for sex.
The 50-year-old health science teacher was shackled with leg irons and wearing a striped jail jumpsuit when he entered the courtroom.
How missing Tennessee student and her former teacher were found
He smiled at relatives who came to watch.
A federal magistrate judge told Cummins he faces a mandatory minimum of 10 years in prison and could get life.
Cummins replied softly, answering that he understood.
Federal prosecutors want him held pending trial. The judge scheduled a detention hearing for Friday.
Authorities: Tennessee student, teacher found in Ca.
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