NFHS made this change about three years ago (I think).
It is significantly different from ASA and NCAA in that the NFHS ruling does not require intent.
The example play would be an infielder moving at the crack (or ping) of the bat to field a ball, ball is deflected by the pitcher, fielder changes direction to adjust and collides with a runner. If the fielder could have played the ball, this would be interference in NFHS.
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