I did not say they knew he was concussed. I said it was obvious he was showing signs or symptoms of a head injury/concussion. That is all that is needed for this rule to kick in. It doesn't matter who took him out of the game, it is the Referees job to stop play and remove him if he allowed back in the game.
That is what the DOD has said in official memos!
http://www.ohsaa.org/members/Memos/2013-08-30.pdf
3. Concussion:**When*a*player*has*signs*or*symptoms*o f*a*concussion*he*is*suspended*
from*the*game*and*may*not*reenter*the*game.**This* is*based*upon*Ohio*House*Bill*143.**
If*an*Ohio*Team*plays*a*game*in*another*state,*thi s*Rule*applies.**If*an*out*of*state*team*
plays*a*game*in*Ohio,*this*Rule*applies.**This*is* because*it*is*a*state*law*now