Hello,
I just encountered a cheater on Official server 1281 | EUROPE - DE | First Person Only (about 10minutes ago - 28th Jan 19:16 UK time)
I was crouched down in a building in Grishno (Chenarus) with no way to be seen, and what sounded like a sniper bullet came into the building and hit me, but it also release a cloud of toxic gas. I thought maybe my back was too close to the wall and so the player could see my bag glitching through the wall, but that doesn't explain the toxic gas.
I knew I would die because I had no way of curing the gas, so I went running around the town looking for him, and no matter which building I went in, the same thing would happen - sniper bullet would hit me through the wall and cause a cloud of toxic gas. It happened every time I stood still. I think he could see me through the walls and was able to shoot me with some kind of modded gun/bullet. It happened 5 or 6 times until one of the houses I burst into had him laying in wait and he killed me.
I love this game but cheaters are really making it not fun to play.