[andreasbleck]

Yes, it is possible to detect but it will work only for some, many of them already patched this, but i'll tell you how: freeze the player when he spawns, get his camera front vector and store somewhere, set a timer of 2 or 3 seconds, when that timer is called after the time you set, you unfreeze him and get his camera vector again and compare with the stored, if it is different then he have that cheat installed, because when you have it and you are freezed, your camera move up and look down, I don't know but I think the camera vector will be higher, so you check if it is higher than the stored one.