How to see if someone's using X-ray texture packs on minecraft?

So I'm a admin on a pretty big server an some people have been snitching on each other on who's using X-ray texture pack and some say some of them made it on there own, I was wondering is there a way to check everyone's texture pack? So there not cheating.

There's not. All you can do is if you have the right plugin, you can vanish and then watch those players mining. You'd need core protect and essentials for that. You can tell when someone's x-raying if they're standing around looking around all the time and mining straight to gold/diamond. Also the plugins show you when your players mine certain ores, so when you see one player getting alot of ores quickly, you know to vanish and spy on them and look for the signs of an x-rayer.