Scouting. Every scout in the country gets a chance to see these guys in HS. You can usually find at least 3 videos of a HS pitching prospect and 10 or so write-ups from guys like Law, Goldstein, Badler, Callis, etc. Going by your own eye (video) and the collective reports from the evaluators, it's pretty easy to get a good read on a prospect. However, with Latin guys that haven't come stateside, you won't find any more than 1 short video, if you even get that. There usually is only 1 scouting report, and that is from Ben Badler. As much as I like and respect Badler, I need more than 1 scouting report on a kid. Maybe I'm more pessimistic than some, though.