Students at some schools in the Northside Independent School District, a public school district serving the San Antonio area, have been required to carry student IDs containing RFID chips since the schoolyear began last fall. John Jay High, where Angela Hernandez was enrolled, is one of the schools included in the initiative.

RFID, which stands for radio frequency identification, involves the use of radio and electromagnetic fields to disseminate information for the purposes of tracking and identification.