Not only do physical therapists spend 3 years in graduate school learning about all of the different systems in the body, but they also must take a certification class post graduation, spending >50 hours learning how to safely administer dry needling and practicing this using their peers. PT's have the knowledge-base to do this appropriately using information learned from their PT program and the certification class as well as their own clinical judgement. There is additionally much research that has been published in the last 10 years that reveals many musculoskeletal benefits of dry needling including but not limited to improvement in pain, range of motion, and tissue extensibility.