Specifically not allowed.
Rule 9.02(c) Comment: The manager or the catcher may request the plate umpire to ask his partner for help on a half swing when the plate umpire calls the pitch a ball, but not when the pitch is called a strike.
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In response to this post by MEHOKIE)
Link: http://mlb.mlb.com/mlb/official_info/official_rules/umpire_9.jsp
Posted: 04/22/2016 at 08:57AM