Can Mattresses Be RFID-Tagged?

There are a few companies that have tagged mattresses. You would need a fairly durable tag, such as HID Global's SlimFlex. It could be attached inside the mattress and should be readable with little problem. You might consider attaching four tags, one on each side, and writing the same ID number to each. That way, the tag would be readable regardless of the orientation of the mattress. This would cost a little more, but the ease of reading the tag might make it worth the added expense.