Re: beaver trap ??
One must be attached to ANY trap or snare or cable restraint.
For beaver sets, I've heard it advised to attach one to the top of the drowner line or have one somewhere visible so your set can be checked by whomever without pulling your trap out of the water. This would be especially useful when you've made a catch and your tag is at the end of the drowner attached to the trap holding your beaver.
"I suppose it is the way of hunters. We are very odd fellows." ~ Peter Hathaway Capstick