They could detect the signal quickly which is exactly why he gave one that needed to be activated once he got near him. If he put an active one on him right away, they would have sweeped him for devices and saw the signal. I don't see why it's a big issue with you guys.
Even if he later activates it and they find it and disable it, the signal will still have pinpointed their position. Or more likely it would be a burst signal on a periodic schedule.
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