It's an issue we all are dealing with. I current have a no pet policy on a house and the applicant has 2 cats and 2 dogs. When I asked if he has any pet he said 2 cats and 2 dogs. I said no pet is allowed at this property she then claimed they are ESAs, all four or them are ESAs!
I posted some information in another thread with identical titles here:
https://www.biggerpockets.com/forums/52/topics/505...
Basically, as landlords the ways I have been able to figure out how to flush out those with real ESAs vs those who just claims they have ESAs either with a bogus letter or paid an online service to provide ESA certification are:
(1) Tell them you do not accept any online ESA certification. It must be certification provided by a LMHP that is actively practicing, currently licensed, and the certification must be dated and valid for the entire period of the lease agreement, and you must be able to call the LMHP to verify. You cannot ask about the nature of the disability but you must be able to call and verify that there is a disability and the link of the animal to the disability.
(2) Someone has suggested providing a form to the applicant to take to the LMHP to fill out, sign and date. I might take this route if I can find such a form. So far I have not been able to locate one.
(3) Have an animal policy in your lease that covers all animals, pets and otherwise. Tenant is liable for animal damages, must pick up after dog poops, clean out their kitty litter box regularly, obey leash laws, etc etc etc...
(4) Have your lease amended saying if a tenant is prescribed a ESA during their lease they must first clear it with you and provide documentation and allow you to verify, failure to obtain written permission from landlord prior to introducing an ESA is a lease violation.
(5) Also clarify that if an accommodation is a no pet accommodation, an verified and documented ESA requires the landlord to waive the no pet clause, only for that specific ESA. In other words, having an ESA does not mean the pet is now allowed, that they cannot bring in additional animals, and their spouse and children can bring in new pets. The no pet clause is waived for that specific animal.
(6) Some states are introducing new laws to make it harder to obtain bogus online certification. For example in Florida there is a bill being considered to require the ESA certification to be provided by a doctor who's relationship to the individual seeking certification cannot be exclusively about providing ESA certification for a fee. In other words, the certification would then have to be from their regular doctor not one one time online service to give you a certificate for $49.95. This will make it much harder hopefully for the fakers. I am considering amending my lease to require applicants who have ESAs to sign that their if and when the bill is passed to require their ESAs to be re-certified in accordance to the new laws within 30 days or it's a lease violation. If your state does not have new laws addressing this I suggest you lobby your senator to make the certification harder and have some real penalty for those who misrepresent.