[niCe]

I disagree. It's possible, but it may be slightly inaccurate in some cases. You can detect if player is in checkpoint position (NOT with IsPlayerInCheckpoint, but with IsPlayerInRangeOfPoint), pressing sprint key (used to select items in menu) and then set short timer to detect if player's health has increased and if the cash has been paid (-$1, -$2, -$5 or -$10). I use this system for anticheat purpose.