JR...I have nothing here. I know that the volleyball guys will talk about the unsporting actions that volleyball put in a few years ago about ppl changing before and after the game w/n the confines of the playing surface, but here I would assume that the NFHS is talking about removing the shirt out of anger, frustration, etc...an actual unsporting act. Plus, I can see this scenario happening:
#33 gets blood on the the jersey.
R: Coach, #33 must be removed from the game, he has blood on the jersey. The shirt has to be cleaned or changed.
C: OK. Jimmy, put this new uniform on right here and check back in.
R: *TWEET* Technical foul, #33 white.
C: But ref, you told me to change the shirt!
BTW..what do you have JR?