The Guns Used To Shoot The Darts Are Co2 Powered Rifles. The Dart Includes A Drug To Sedate The Deer As Well As A Transmitter To Track A Deer’s Location. In Order To Conduct Any Research Where They Will Actually Touch, Restrain Or Capture An Animal, Researchers Are Require By Law To Obtain Special Permits. They Must Also Attain Permits For The Restricted Use Chemicals In The Drugs Used.