A Texan student who refused to wear a badge with a radio tag that tracked her movements has lost a federal court appeal against her school's ID policy.
The radio chips track attendance, which in turn helps secure school funding.
But Andrea Hernandez, 15, stopped wearing the badge on religious grounds, saying it was the "mark of the beast".
After John Jay High School suspended her, she went to court and won a temporary injunction to continue going to the school, without the badge.
The federal court ruling overturned that, saying if she was to stay at the school, she would be required to wear the badge. Otherwise, she would have to transfer to a new school.
The new identification policy at the Northside Independent School District (NISD) in San Antonio, Texas, began at the start of the 2012 school year.
