I'm pretty sure you have to be a licensed veterinarian to legally be able to poke anything with a needle in all states- last I looked into it, that was the law anyway-
Peggy fleming is a vet and certified in all the aspects of it. she teaches courses and hands on as well. its a intense very informative course. I know 2 trainers that went and although do not do outside horses use it on their own in training and their own personal horses.. which is several.. its a learning process and courses move you up .. It is not however for someone wanting to make a career out of it I dont think.. she can look into it more..