While rummaging through my stack of stuff, I found the following on page 86 of the 2011 Rules Book....
INJURY TIMEOUT CONFERENCES RESTRICTED TO OUTSIDE NINE-YARD MARKS (2-6-1,2;3-5-8) :
With two changes, the committee labeled the two types of authorized team conferences ( "Outside Nine Yard Mark Conference" and "Between Nine Yard Mark Conference".) In addition, the committee specified that when an injury occurs and the referee grants an authorized conference, it must be an "Outside Nine Yard Conference'. This will give medical personnel time and space to address the injured player.
My first concern
of inside/outside was :
while laying on the ground, looking up
or up in the air, looking down
. The "Between..." helped to clarify. IMHO, if it's an injury involving anything more than a coach coming out to help his player off the field, I going to send both teams to the sidelines (if the injury is on the sidelines, you've got a 50 yard team box range to send the kids away).
I could also find reference in the 2012 NFHS S & I on page 49. Hope this helps
....happy hour nears... that means time for a clam broth martini - shaken not stirred....