What makes this a legal activty? Are you a game warden or work for the DNR in your state? Personally if the state gave the oppertunity to dart deer for reshearch for say TB or bovine, I might take them up on the offer. However, if your intentions are to gain profit from Darting for Dollars then I would find your operation to be not in good taste. Most likely a violation of state game laws too. If you have that many deer then set up a hunting camp for the handicap hunters or war veterns and run it as non profit organization taking in donations/sponsers to stay alive.