I have only heard of them using tracking devices hidden in the pack if A. It is a huge order (with a tracking device implanted into a kilo of coke or something) B. They have reason to believe the pack was sent to a fake ID box or other location that doesn't have a direct connection to the person picking up the package edit: Oh, just noticed you didn't say tracking device but device to determine if the package has been opened. I have never heard of them using a device to determine when the pack is opened, although I do think it is a good idea for vendors to include such devices in packages they send to customers. Then customers can remotely detect if the package has been opened in transit, prior to picking it up...of course this assumes that the pack is shipped to a box with no tie to the person picking it up. We really need to get these devices implemented, they should be very cheap and very effective at detecting interceptions.