‘RFID’ Fabrics contain an undetectable tracking chemical

CNET is running a story about a new way of tracking things:

"Why attach an RFID chip to a shirt when you can identify the shirt through undetectable, invisible chemicals mixed into the fibers?…

[CrossID] has devised a way to put a chemical signature into fabrics, labels, inks, boxes and other materials. When a hand or door scanner tuned to a specific frequency is pointed at an item, chemicals mixed inside the item get excited and give off a signal. The signal, which differs with the addition or subtraction of different substances, then serves as an ID for the item."