I got asked by a friend to help get him a one off date.  All I can verify about the guy is that he isn't LE.  
 
What would you do?  My feeling is that he's on his own but I don't want him to get himself in trouble with LE or get scammed

Nothing good can come from that.

you can meet him in person. Cause it could come back to haunt you?

Maybe he thinks it will be a one off date thing, but as soon as he pops he won't be able to stop.  

Maybe this only works if you have a provider/friend you know well. You can make an introduction with a personal recommendation, but it's not your job to verify the guy. The provider will still need to screen in whatever way makes her comfortable.  

Actually a lot of good could come from more people sharing that they see sex workers. There's nothing wrong with it.  People keeping this secret as *if* there is some reason to hide is a good part of the reason why sex work has to be kept in the shadows. Fully functioning, regular people hire sex workers. So what?.

Set up 3 buds with ladies that I trusted.  No problem s.

If we both had the same taste in women it would be easy - I'd give him the name of a reputable lady that I have already seen and had a great time with and wish him luck. Once I give him a name he's on his own. Giving him a great starting point and sending him in the right direction would be my help

Sharing advice that newbies without references and an established reputation like your friend should know, then why not? Especially if you trust him. But verifying that your friend isn't LE doesn't even begin to constitute proper screening. Even though LE is a factor, there are so many other possible risks to providers' emotional and physical safety besides LE.  

Explained to him how unsafe that is.  
No reviews, possible LE sting, bait and switch, pimps waiting for you after you're done etc...
 

Do not share with him your TER handle, unless you trust the guy like a brother.  (Not the evil twin kind of brother, however, the nice "always has your back" brother.

Nothing good can come from introducing a friend to this world, especially a married friend, as then I join the hooker in being a homewrecker.

Maybe I am not the most sympathetic to your friends cause here, but no way would I do what you are suggesting. All the up side is to your buddy, and none for you. I've done more solids then I can count for various friends through my life. Can't say I was ever looking at the time I did them for any kind of a good deed badge, but time and time again, I have been surprised how short those pal's memories got after the fact. And as far as telling a buddy of mine the contact info for a local lady who I have found that does things the way I like so that if I were to recommend someone, she would be it? That's nuts. You would only have yourself to blame the next time you tried to set up a date with her and she was too busy.