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Umpires do not decide or announce changes in the strike zone, that is determined by the MLB Rules Committee. The last such change by the committee was in 1996, when the lower limit of the strike zone was changed from the top of the knees to the bottom of the knees. Umpires simply call the strike zone on what THEY PERCEIVE as the size of the zone in the rules in effect at the time.

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Q: When did mlb umpires last announce a change in the called strike zone?
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