I'm a new U and just learning. But I hardly ever blow my wistle on a scrimage play. I did blow one Friday that was at my feet, I saw 100% that he was down and nobody else could see it. My R told me it was a good wistle. I will blow it on a kickoff of course if the returner is downed in my area. And the others like you said a deadball foul (snap infraction or false start). I'm not experienced so will also be interested in reading the responses to this thread.
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