The following rule has been added back to the SHOW Rulebook, effective immediately.

5. FLAT SHOD PLEASURE DIVISION: Section B: General Rules for All Flat Shod Pleasure Entries:
(7A.)  Bit guards/slobber guards or bit burs are prohibited on any snaffle bit. This does not apply to a bit with shanks.

The SHOW Rulebook can be found in its entirety on the SHOW HIO web site.