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MLB has decreed that teams must have fans screened by either handheld or walkthrough metal detectors by the 2015 season.
Per the report from the Associated Press, an MLB spokesman says that this is the result of MLB working with the Department of Homeland Security to "standardize security practices."
We will have to see how this is going to be implemented, but if it is like going through airport security -- as suggested in the story linked above -- you would have to think there are going to be long lines stretching out of stadiums, as fans wait to be admitted.