Has there been any changes to strip properties since the failure on the carry ban bills in the state senate? What about Resorts World?

Conceal.  They never need a reason to ask you to leave.

A while ago Wayne Root was advertising for some kind of gun detector system. I'm watching for evidence of that shit.

Wynn has that installed.

Concealed means concealed. All strip casinos have a ban on Firearms and Weapons of any kind. If a bulge is observed or anything that resembles a firearm or weapon is seen, Security will request to verify if it is a weapon. In "Some" cases, they may offer a check in service for the firearm but that is case by case (Advice: Don't be a dick about the right to carry and usually we will help you). There have been an increase in firearm related calls on the strip which has prompted a more direct approach from the Security Teams. At some properties, they have already posted the "No Weapon" signs at every public entrance. Trust me, it's there regardless of size. Don't leave it out in your room (If you are staying in the Hotel) either.

Remember, it is still private property with the right to Trespass and Evict.
My two Cents.

Do you know how it works?

They use a form of millimeter wave radar, and as Wolfpack said, the sensors are hidden as opposed to some mechanism like a metal detector where you need to walk through an obvious device.

https://patriot1tech.com/patscan/multi-sensor/