NSA...Please help me find Injury Rule

[Bandit]

Daughter is involved in NSA state tournament this week-end. One of our defensive players was hurt while on the field. Situation: 2 runners on base. Ball hit sharply towards the hole between the second base person and the first base person. Right Fielder charging. Ball hit fringe of grass (where infield dirt stop and outfield grass begins) Ball comes up and clocks the right fielder right in-between the eyes. right fielder goes down. After play is over and fielder removed from field the umpires inform the offensive team they cannot use that particular bat again until it has been inspected by the tournament director or the UIC. Because a player was injured. #1. Where is found in the book. #2 it wasn't the bat or the batter fault this happend and the field is really a good and well kept diamond that is a part of a youth complex with about 8 diamonds on it. It was a freak, instantanous accident. But I would like to see where this is a NSA rule?