I always review code I get from AnyWhere - co-workers included - to make sure I understand it before I start working with it. And it always goes on a test system first, with comments about where it came from. If it's pretty simple (SELECT xxx, yyy from zzzz) I won't spend a lot of time researching it, but anything complex or esoteric or unclear definitely gets researched and cross-checked to the best of my ability. Which sometimes means running it by co-workers with better SQL skills than mine. If we can't understand it, it doesn't go anywhere other than Notepad.