 The Louisiana Academy of Medical Psychology (LAMP), currently the largest organization of psychologists with prescriptive authority in the world and the only organization representing practitioners of medical psychology in Louisiana as defined by Louisiana statute within any jurisdiction in the United States, no longer recognizes the Academy of Medical Psychology as an adequate certifying body for its practitioners, and its members have resigned from the Academy of Medical Psychology en masse.Similarly, virtually all members of LAMP have also resigned from the Louisiana Psychological Association (LPA) after many LPA members uncovered that the LAMP's prescriptive authority movement covertly came to an agreement with Louisiana's medical board to transfer the entire practice of psychology for psychologists with prescriptive authority to the medical board.Louisiana is the only state in which the practice of psychology, including psychological testing, psychotherapy, diagnosis, and treatment for some psychologists (i.e., medical psychologists) is regulated by a medical board.