All of our SIGMA PSEUDO CANINE TRAINING AIDS were developed with canine trainers and handlers from around the country and have been thoroughly field tested. SIGMA PSEUDO CANINE TRAINING AIDS are currently being used by dozens of canine trainers and handlers, police agencies, and search and rescue teams in the U.S. and in several foreign countries. SIGMA PSEUDO CANINE TRAINING AIDS are designed and intended to be used solely as canine training aids.