Law mandates that the letter be issued and signed by an MD or a licensed mental health professional. We have a variety of licensed mental health professionals in our network. For a little more information on the laws regarding ESA's and the Fair Housing Act please visit the resources below.
Emotional Support Animal FAQ- https://www.animallaw.info/article/faqs-emotional-support-animals
Right to ESAs in "No-Pet” Housing - http://www.bazelon.org/LinkClick.aspx?fileticket=mHq8GV0FI4c%3D&tabid
Emotional Support Animals in Housing- http://servicedogcentral.org/content/ESA-housing