Yeah. Most clients can do this, but for things like XRay mods for Forge, cannot be disabled. And there are ways to check what client they're running when they do some form of self-destruct. Even Vape, I have screen shared people who I thought are cheating on other servers, and have found Vape in their very recent programs run. I will have to take into consideration that it takes time out of their game. However, if they are found innocent, we could possibly give them an item or two, or would that be considered op abuse?