A court challenge has delayed plans to expel a Texan student for refusing to wear a radio tag that tracked her movements.

Religious reasons led Andrea Hernandez to stop wearing the tag that revealed where she was on her school campus.

The tags were introduced to track students and help tighten control of school funding.

A Texan court has granted a restraining order filed by a civil rights group pending a hearing on use of the tags.

ID badges containing radio tags started to be introduced at the start of the 2012 school year to schools run by San Antonio's Northside Independent School District (NISD). The tracking tags gave NISD a better idea of the numbers of students attending classes each day - the daily average of which dictates how much cash it gets from state coffers......

Some companies track their mobile phones, so that's already under way.

Just put it in the microwave and then wear it

I believe this is something to do with the barcode. That's been a bone of contention with certain Hatstand Christian groups for a long time. Apparently they all contain the number 666.