Source: Craig Calcaterra, Hardball Talk 
Enough of a ruckus was raised by the video of Jon Lester floating around that Major League Baseball has issued a statement on the matter:
“We cannot draw any conclusions from this video. There were no complaints from the Cardinals and the umpires never detected anything indicating a foreign substance throughout the game.”
This is the video in question. Jon Lester was thought to be using a substance to help his pitching.
— Tim McKernan (@tmckernan) October 24, 2013