Does that mean as far as HUD's fair housing is concerned, there is no distinction in their policies and guidelines on how SA and ESA owners are to be treated/screened/verified by landlords?

The zoning distinction is attempting to preserve some housing for locals, but also help provide some accountability for STRs when they have the rules and amenities of HOA communities.

Rather than commingling funds and ownerships, separation using distinct LLCs could have some benefits.

Now, I know that some of these authorities can be quite irrational (my city holding the dubious distinction of being THE prime example!)

Today, I have the distinct pleasure to be fully hands on with a highly organized and sophisticated organization.

The time I did win I ended up with the distinct impression that the "bidding" was totally manipulated by auction.com and that I was the only bidder.   

This is an important distinction.

Insurance companies do not care about the distinction of service animal vs. pet.

@Angela Abe As you do your research, it's important to note that there are 2 distinct account-structures that are referred to as "self-directed."

Heating oil smells , you can get a good idea just with your nose .Diesel/heating oil does have a distinctive smell, but if a leak occurred sometime in the past and there is no active leak or oil present in the tank, you may not smell anything until you disturb the contaminated soil.