In PA, anything like that is illegal. No electronic devices may be attached to the arrow or left behind in the animal by the arrow for the purposes of tracking.

It would be a nice idea, but what about the times when you don' t get full penetration the animal breaks off the fletch end of the arrow during the escape (hit the opposite side shoulder)?

My concern would be that many hunters would rely on that method of tracking as opposed to blood trailing, so when things go wrong....and they always will, they will not be able to finish their hunt and find the animal.