Brand new to this.  What is the LE test? I've seen it mentioned a few times. But have no clue what it means

At one time, you could show up at a place and you would be greeted by a hostess who would ask to see your johnson. You would usually just unzip and pull it out a bit. The hostess would then drop down and give a few sucks. THAT was supposed to be a test of whether or not the guest was LE (Law Enforcement agent) or not. After all, a REAL cop wouldn't let the lady suck his dick when no money had been exchanged or any sort of arrangement discussed, right? WRONG!  
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LE can go along with whatever happens and pull out their badges -- Surprise!! -- at any later time.  
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LE Test: A quick suck just inside the door in an effort to rule out that the guest is LE. The test is not reliable.

It went by various names but the one I recall was Jerry's. I went there once because I wanted to see what happened and also because it was an '80s-style cathouse and I wanted that experience again. Sad to say, there was no LE check that night. But I did score a hot thing who called herself "Egypt."

Jerry's descended from Julie's (the original). Julie would sometimes provide the LE test herself. Julie spent some time upstate (New York lingo for "in prison." (Sing Sing http://en.wikipedia.org/wiki/Sing_Sing is a max security prison in Ossining, NY which is "upstate" from New York City. Most NYS prisons are upstate from NYC. Even though Julie (and many others) weren't incarcerated at Sing Sing, "upstate" is still used generically for "prison.")  
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Back to Julie's ... When she went upstate, Julie transferred her  "assets" (business assets, that is) to Jerry who I think is her son. It was then named Jerry's and Jerry's Office Cherries. (I was visiting Kylie in an apartment over on 9th or 10th in the upper 40s. As I left the room into the living room, there was Julie and Jerry and somebody else! I chatted with Julie about "old times" near the Lincoln Tunnel entrance. We swapped stories and were yakking it up and then somebody said ~"You really have to go now. We've got to discuss business. Thank you.")  

After Julie returned from "upstate" I think that Jerry was forced out. Then it became Jewels and Jewels of New York (JONY).  The place eventually became Gentlemen's Choice. (I'm not sure of the Jerry's - Jewels sequence. I pretty sure it was Jerry's and then Jewels but it might have been Jewels and then jerry's.)
 

...or even touch it was what one person told me. If it is a female undercover LE, she will not do it and you can just leave.

But it is obsoleteadvice, pointless and doesn't work because cops are allowed to lie and will do almost anything to keep up the facade. They may even have immunity agreements for certain misdemeanors committed while undercover.

Also, in the modern age, they will have all the info they need from texts and there will usually be no female officer involved. Possibly one may be on hand in case someone calls the line. As soon as you get to the motel room, six meathead cops will tackle you to the ground, confiscate your phone to confirm the messages, arrest you, process you, and in NYS probably issue you an appearance ticket as it is a misdemeanor.  

Then setup for the next guy.  

I've done A LOT of research on stings, mostly watching YT videos and reading articles from around the US. Some of the police departments love to brag about how they get these guys, especially Grady Judd down in Florida. Use that to your advantage. lol

An escort agent I watched on YT even claimed that in Las Vegas, male cops will have sex with the escort and then pull out his badge and arrest her, which I am skeptical about as I cannot see that holding up in court if she has a somewhat competent lawyer.

There is no entrapment in Nevada cops can and do have sex with girls and arrest them after I know a girl who gave a cop a bj and got arrested right after she finished. Plus it doesn't help the legal system top to bottom is corrupt asf and could care less what they do that's illegal or immoral as long as they get an arrest it doesn't matter to them how they did it.

Asking someone to expose themselves is not a reliable test. LE rarely uses actual officers in stings. They use CI's. They can pretty much do whatever.