From AKC Website off their 'Event Committee Bulletin' Summer 2011
Training Collars
Special training devices that are used to control and train dogs, including but not limited to, collars with prongs, electronic collars used with transmitters, muzzles and head collars may not be used on dogs at AKC events, except as allowed in the AKC Rules, Regulations, and policies. If not already included in AKC rules, regs, and policies, I sure hope AKC makes an immediate amendment to include exceptions for SDs and ADA laws.
The American Kennel Club recognizes that special training collars may be an effective and useful management device, when properly used, for controlling dogs that might be extremely active, difficult to control on a neck collar, or dog aggressive. These collars are also recognized as possibly useful for gaining control at the start of basic obedience training, essential education that dogs deserve and need. Special training collars are utilized in other situations; not only for the uses as described above.
There is a point at which owners should have sufficient control of their dogs to manage them on regular neck collars, without the use of special training collars. This is the point at which dogs are acceptable on the grounds of AKC competitive events and will have the opportunity to participate in those events. This appears to be written specifically for exhibitors/dogs entered in competitions.