Parkway School District’s proposed sex education curriculum opposed by the Catholic Medical Association, the American College of Pediatricians, the Christian Medical and Dental Associations, and the Medical Institute for Sexual Health Posted on March 9, 2016March 12, 2016 by stlouiscma Letter to the School Board: Supporting Research: Addendum: A more complete comment on the mechanism of action of Plan B can be found in CMA’s position statement on emergency contraception.