Not every time. I would only do it if it's a close call between being legal and illegal. To do it every time would be overkill, and could take focus away from the next contact.
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Felix A. Madera
USAV Indoor National / Beach Zonal Referee
FIVB Qualified International Scorer
PAVO National Referee / Certified Line Judge/Scorer
WIAA/IHSA Volleyball Referee
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