"He's got the green light," Gaston said. "But he can't go any time he wants."
Gaston noted that the only player who has a pure green light -- the ability to steal bases on his own terms -- is center fielder Vernon Wells. The Blue Jays pick their spots with Lewis, who has swiped three bases and been caught stealing twice in 26 games.
"Even though you give guys the green light, you have to know which ones you can really leave on their own. Vernon's a guy you can leave on his own. He's not going to make bad choices," Gaston said.