it can't be a protocol. >> but that changed after arrington graduated. in 2010, the ncaa required schools to develop guidelines for concussion safety. but arrington's suit alleges that this safety mandate was designed to be weak. >> some of these emails are shocking. i would call them smoking guns. >> internal ncaa emails show former head of safety david klossner pushing for more stringent rules, and facing pushback from inside the organization. >> very interesting email here from klossner where he says, 'return same day issue seems to be our biggest barrier. i've yet to find legitimate data to show that same day return to play is a good thing.' >> klossner's the one in here who keeps bringing up the idea about rules for return to play, the safety of this and what an issue it is. >> "i've been pretty busy with meetings, and trying to get david klossner off my back. that dude wears me out." >> so the one guy raising the red flag here, is getting shut out? >> shut down, suppressed, and criticized. >> i think it's a big lie and a big facade that the ncaa is