You might not know the acronym, but you know the technology.

Radio Frequency Identification, known as RFIDs, are the little chips in EZ Tags. They store information about you and charge your account every time you pass a toll plaza.

Plus, RFIDs are also the little metal strips that prevent shoplifting.

Soon, the same technology might be common on school buses; telling districts which child boards which bus.

“It gives me a comfort to know that if they get off at the wrong spot I'll at least have a place to start looking for them," said one Spring parent in a 2004 interview.

RFIDs on school buses were still a novelty when Spring ISD introduced them four years ago.

To register their boarding, students would pass their school IDs under a scanner near the driver.

Now other districts, including Galena Park ISD, are considering installing similar systems on their school buses.

But the American Civil Liberties Union says parents should think critically about this. Anyone, perhaps even a predator, with an RFID reader could find out all about your child, their name, age, grade, maybe more, without getting close.

"Parents are very careful not to send their kids out with name tags, with names of their sweatshirts, with names of their T-shirts for just that reason,” explained Maida Asofsky, Houston Regional Director, ACLU. “So why would they send them out with RFIDs that could be read by some stranger?”

RFID readers are not that hard to find; always for sale on eBay.

Some could potentially read the data on a child's card from a distance.

Districts discredit any notion the technology puts kids at risk.