[QUOTE=Peggy;8339247]
Hoping not to derail but, speaking of nonconventional in the eq, where does a kimberwicke fall on the scale? Because the second-place horse in the THIS medal was wearing one.
http://www.chronofhorse.com/sites/default/files/ElliYeagerDSC_6367.jpg[/QUOTE]
Yes, the rein is in the bottom slot on the bit.
Kimberwicks are considered to be “unconventional” tack under USEF rules. Personally, I think they can end up being a useless bit and make the horse harder in the mouth…but again, it entirely depends on the individual horse. I would much rather see a competitor use a pelham rather than a kimberwick. The other problem that often goes hand in hand with a kimberwick is the dreaded rein converters.
Fine for young, inexperienced riders, not so much for the experienced rider that should be using two reins. 
It should be noted that, under Equine Canada rules, kimberwicks are considered legal tack and NOT unconventional.