umpire observation of illegal bat

RulesMLB Umpire Manual

INSPECTION OF AN ILLEGAL BAT

Rule 6.03(a)(4): The following policies are in effect in regard to corked, improperly treated, and otherwise altered bats: First, Official Baseball Rules 3.02(a) through (d) and 6.03(a)(4) are in no way changed or affected by the policies set forth herein. These rules, which define the construction of the bat, the use of substances to improve…

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