Just received an email from our coordinator of officials at the Nebraska School Activities Association, the NSAA. Here's what he had to say.

Brent,

The NSAA's interpretation is taken from the NFHS Rules Book. Page 19,
1-5-3c refers to "as directed in writing by a licensed medical physician
(M.D./D.O.)". Also page 39, 3-5-10b refers to an unconscious "player may
not return to play in the game without written authorization from a
physician (M.D./D.O.)".

This is an area the NSAA will continue to monitor, but for now Nebraska
will only accept M.D./D.O. authorizations.

Larry Mollring
NSAA Assistant Director
Supervisor of Officials