I'm going to report a teammate's potential drug use
Why do you feel like you need to be the one that shares this information?
Because I want to be known as the guy that takes things seriously.
Your intentions make sense, but are you entirely certain that this is your place to step in? If you don't know for 100% that he is doing drugs then most people would just let this one go until they know for sure.
I am going to do my snitching so that he doesn't do any harm.
While it sounds like you really care about him and this team, instead of snitching why not just speak with him first? You could find out if he's really doing the drugs, and if so then find out why. That sounds like a lot better way of handling this situation, doesn't it?