I'm lenient and will warn if they are close to being off the line when they are supposed to be on. But if they have 5 guys obviously in the backfield (i.e. 2 receivers that are both being punched back, a QB and 2 RB), there will be a flag and no warning. If one of those receivers is close but still technically in the back field, I'll put him on the line and warn him after the play.
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