The following are not required to be licensed:
(1) a "PT student" who is a student enrolled in a board-approved physical therapist program while engaged in completing the clinical education requirement for graduation under the on-site supervision of a physical therapist who is licensed to practice in this State;
(2) a "PTA" student who is a student enrolled in a board-approved physical therapist assistant program while engaged in completing the clinical education requirement for graduation under the on-site supervision of a physical therapist or physical therapist assistant who is licensed to practice in this State;
(3) a physical therapist or physical therapist assistant licensed in another state who is teaching or participating in special physical therapy education projects, demonstrations, or courses in this State;
(4) a physical therapist or physical therapist assistant solely employed by the United States Armed Services, United States Public Health Service, Veterans Administration, or another federal agency and practicing within the scope of employment.