Horse Collar: run between the tackles

[hefnerjm]

quick question...I have worked alot at the wings, but was working R last week in a JV game.
Ball carrier was tackled on a running play up the middle.  The tackle was clearly made by grabbing inside the top of the equipment and pulling down from behind. 

I dropped my flag for a horse collar, but then immediately found myself questioning the call...In that moment, I half-remembered a post on this forum about horse collar tackle not being a foul when it occurs in the tackle box.  After conferring with my U, I waved off my own flag.

What would you have?  Foul or not? please provide a rule reference

[Legacy Zebra]

No foul. 9-1-15. The horse collar rule does not apply to a runner in the tackle box. Note that exception also includes a potential passer.

[cmarrufo]

Horse Collar Tackle.
 In the TASO 5 man mechanics manual on page 80

SECTION 27. TASO OFFICIATING PHILOSOPHIES 5- Official Mechanics
Horse Collar Tackle:
 It is not a foul for a Horse Collar Tackle inside the tackle box.

[hefnerjm]

Thanks guys.  Glad to know we got it right.