From the NY Times
Hotel guests may want to think twice now before walking off with that bathrobe. Linen Technology Tracking, a company in Miami, has patented a washable RFID chip that can be sewn into towels, robes and bed sheets, allowing hotels to keep track of their linens.
So far, three hotels — in Honolulu, Miami and Manhattan — are using the chip, said Linen Technology Tracking’s executive vice president, William Serbin. He said the hotels did not want their names used. [emphasis added]