Emotional Support Animals

[Mona V.]

My rental has a no-pet policy. Mainly because the septic field of the house was just repaired and its all dirt, an animal can really destroy it fast. Its seriously costly and if its destroyed now I really wouldn't have much to repair anymore. A lot of people contact me and when I deny saying they mentioned pets and we have a no-pet policy, they claim its an ESA . I went through all the forums I could find here and I have gone through the Fair Housing Laws regarding disabilities and ESAs, but still have some unanswered questions.

Can I deny based on - "The presence of the assistance animal would pose an undue financial and administrative burden to the provider"?

If not, I would like to give them a form and require them to get it filled by their licenced medical provider, like a lot of people mentioned in forums. But I could not find a copy of such a form anywhere. I see only the letters from the fake ESA certification sites when I search. Can anyone point me to a solid form to use for verification, a letter which I can ask them to take to their doctor to fill. 

Is it ok to call the medical provider too for verification?

Thanks!