Carol, I would have to say no they are not.

Once you get your little plastic cards from the printed out manifest (in the outdoor tent), you are basically into the system as it were. You then enter a tent and the security line is right next to the counter where you drop your luggage. Then it's screening and entry into the larger departure waiting area. THe restrooms are the trailer type porta-potties. Best air-conditioned part of the experience! lol

We returned with two cats that we are fostering until they can go to the SPCA in Virginia. Their owners are leaving SXM and returning to Europe because the state of the French side after Irma, and they could not take their pets with them.
They allowed the owners to come as far as the luggage drop with them. The little dudes have their own passports...so cute, pictures and all. And of course medical records and certifications which had to be presented at check-in.

Not sure there would be a purpose to dropping your luggage off any earlier than your flight. It's not like the old days that's for sure. Missed the Executive Lounge with snacks, wine, and WiFi!
We were through the whole process in 20 minutes, and that's with pets.