The Washington State Legislature is very specific that EMG/NCS is within the scope of Physical Therapy practice:

A physical therapist may perform electroneuromyographic examinations for the purpose of testing neuromuscular function only by referral from an authorized health care practitioner identified in *RCW 18.74.010(7) and only upon demonstration of further education and training in electroneuromyographic examinations as established by rule. Within two years after July 1, 2005, the secretary shall waive the requirement for further education and training for those physical therapists licensed under this chapter who perform electroneuromyographic examinations.

EMG/NCS Testing uses electricity and Musculoskeletal Ultrasound uses sound waves for the evaluation (testing and measurement) of the neuro-musculoskeletal system.

APTA fully supports PTs practicing EMG/NCS Testing as it is within the scope of Physical Therapy Practice. The Orthopedic Section of the APTA in a white paper not only advocates the use of Musculoskeletal Ultrasound Imaging within the scope of practice for Physical Therapy but also endorses its application both for diagnostic as well as procedural purposes to aid neuromuscular re-education, dry needling, and electroneuromyography.

Find here information about Direct Access to Physical Therapy in your state.