Physical therapists are well trained to perform dry needling. Physical Therapists complete  a 3 year doctoral level program with extensive training in physiology and anatomy. The use of  dry needling for helping patients with pain is natural extension of their skill set. The practice is supported by the  the American Physical Therapy Association and by practice acts in almost every state (only 5 to my knowledge bar the practice). There is plenty of pain to go around. Limiting a technique to one specific group is unfair to the patient and restraint of trade to the other professions.