I hold a PhD in neurobiology and human anatomy, and am primarily a biomedical reaearcher.  I learned trigger point therapy in 1984+, and practiced a form of it for a number of years.  Trigger point therapy never really worked for me; this is probably because it does not make sense physiologically.  Using needles to stick "trigger points" has no scientific basis, and the literature supports that it, like its cousin acupuncture, does not work beyond contextual effects.  The content of the training courses for dry needling is primarily review of anatomy, and seems predatory.  The practice of dry needling promulgates unscientific practice, and as such should not be licensed or practiced by anyone.