Major League Baseball said Tuesday it will enforce new guidelines around pitchers using foreign substances on baseballs during games beginning June 21.

The league office announced that it will empower umpires to check pitchers regularly for banned substances, even if clubs don't request searches. Relief pitchers will be searched for foreign substances after the inning they pitched or when they're removed from games.

In addition, MLB said umpires will be urged to check pitchers when they notice "the baseball has an unusually sticky feel to it, or when the umpire observes a pitcher going to his glove, hat, belt, or any other part of his uniform or body to retrieve or apply what may be a foreign substance."

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