Introduction
The addition of reqhttp has made this easy thanks to SQ, so I wrote this to help you in recognizing VAC banned players.

This simple lua script will request data from steam web page. If player has ever been VAC banned, they will not be able to participate in the game.(Can be set in settings)

This script also includes the function to identify the previously distinguished VAC banned players, so as to reduce the network usage of the server.

Settings

: USGN log directory
: VAC recognized SteamID list directory
: Log VAC banned players' USGN if they have it.
: Allow VAC banned players to play?
: Kick VAC banned players?

Note
To ensure that VAC banned players do not evade by simply logging out of steam, I forced them to log in to steam in order to play. DO NOT REMOVE THIS LINE OF CODE OR THEY MAY EVADE THE CHECK.

This script has its limits that if a player is so dedicated to ruin the game, he may join with an entirely new account without VAC record. So manual moderation is always the best choice if possible.

Updates
Added option, changed to .

Issues
Frequent requests seem to make steam ignore the request, looking for a work around.

License
This content is published under WTFPL 3.0.

I'm working on it. The "already checked" function won't be hard.

Would be cool if this saved the ID's in a file so you wouldn't have to send a request each time you want to check.

Yeah, it's just that you are using "#req". I believe there are better ways of managing requests.

This for example doesn't work.

Because I cannot check for the players' ID with just the special ID.

@ Talented Doge: Why are you using req[i][id]?

Reason added.
Code made tidy and simple.

@ Talented Doge: Add "reason" in the kick function.
Thus please make the code more clear and simple.

@ SQ: Yes, I tested the method with a VAC banned profile by directly requesting that profile and it returned the desired result.

@ Gaios: Some.

This can only prevent players who do not have the time to register an entirely new account. But it is nonetheless yet another way to prevent cheaters.

By the way the frequent requests seem to make steam drop the requests, maybe add another parameter to reqhttp to set a delay? I'm lazy to user timers

I wonder if anybody uses Vac Banned account

Great, that's what I did reqhttp support for. Did you tested it, does it work?

Noice m8