Sources: 49ers' Smith (concussion) ruled out

[police brutality]

http://api.tweetmeme.com/imagebutton.gif?url=http://espn.go.com/nfl/story/_/id/8651667/alex-smith-san-francisco-49ers-concussion-ruled-sources (http://api.tweetmeme.com/share?url=http://espn.go.com/nfl/story/_/id/8651667/alex-smith-san-francisco-49ers-concussion-ruled-sources&service=bit.ly&source=espn)San Francisco 49ers quarterback Alex Smith will not play Monday night against the Chicago Bears because he was unable to get clearance from a neurologist one week after suffering a concussion, according to sources.

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