As a connoisseur of various drugs lol I don't care for X it' screws with your body temp too much. Good coke is a good drug. It's expensive lol but hey. Get you a good eight ball of coke, some rum and coke and a blunt, you're good to go. Good times.
The thing about coke though is a good treadmill workout lol will get it out of your system. It stays in your system for like 2 days. Unless you have been doing a lot and you have a lot of build up in your blood. if you're doing it every weekend then going 2-3 days isn't going to get you a clean test. Or he's just that big of an idiot to care about testing in general.
It really is hard to get popped for a positive UA for coke I mean most people don't even do it that much to worry about that. Weed stays forever though.