Carroll evaluates Stafon Johnson

Tailback Stafon Johnson was named USC's top punt returner on Thursday. Joe McKnight still has an opportunity to regain his spot, which he lost after struggling to hang onto the ball (an issue that was chalked up to McKnight's trying to start his run before securing the rock). Here's Carroll talking about the improvement of Johnson as a tailback and in general, specifically compared with his rough freshman campaign:

-- Adam Rose