Sharp things: Good for you on offering to help the local law enforcement types.
I am NOT sure where you live but in the greatest state of them all (Montana) "retrieving Big Game" is part of "Hunting Big Game".
Electronic devices of some sorts (cell phones, walkie talkies etc) are NOT legal to be used to aid in Hunting Big Game.
If I were you (and I am not!) I would make double sure that your contention is legal regarding searching for Big Game (that you THINK may be dead!)!
Best of luck to you and with the drone, I watched the whole video - you did a good job of flying it (I am guessing at that) and filming.
Hold into the wind
VarmintGuy