We will be renting to some people who are nurse practitioners. 

Many believe that it is merely a way that the State Bar generates added revenue and protects certain practitioners.  

(In Ohio, unless the tenant recently moved to the state you can require that the letter be from an Ohio health practitioner)The tenant is required to have a legitimate relationship with the healthcare provider... you don't have to accept any old website certificate: ask the tenant and the provider if the tenant sought out this provider specifically to obtain an esa and if the tenant has been seen by the practitioner before or since.You may ask for vet records showing that the animal is in good health, free of parasites and has all required vaccinations.

Good chance it’s on the up and up, but bad practitioners need to be exposed.

He is more of a general practitioner as apposed to a specialist. 

AT section 9101, paragraph .27 of Interpretation No. 2 states that a practitioner is precluded from giving any form of assurance on matters relating to solvency or any financial presentation of matters relating to solvency.

Any doctor who can legally prescribe treatment may do so.Usually, a doctor won't prescribe anything outside of their scope of treatment, but depression or anxiety are pretty common and even a family practitioner can go there! 

It similar as the difference between a general medical practitioner and a brain surgeon .

A sole practitioner or attorney with little scale might be much higher as you pay for their learning curve. 

CALL YOUR LOCAL COSTAR SALES FOR PRICE - But for sole practitioners, you may be looking at $300+/month.For comps, I have to begrudgingly admit, CoStar is probably best.