I have to say that working at DL and having a sister who owns/trains smaller service animals....there is no way anyone could sneak in a dog to DL itself...maybe DTD if they are discreet. When I go places with my sister, we often have 2 dogs (one that we have is certified and the other is in training.
Dogs in training will sometimes bark, it does not mean that they aren't "real" service animals. It just means they may be young or new to the training process. The only way for them to get better is to keep taking them to public/crowded areas so they get used to things. For example, our one dog who is now 100% certified used to bark during fireworks...they scared her as she didn't know what they were. We just continued exposing her to the noise and she learned that they were OK and not a threat.
I have gotten some really nasty comments/rude remarks about our dogs and it is sad that people only think of seeing eye dogs as service animals. Luckily most cpmpanies are really good about seeing the vest or ID tag and realizing that this is not a pet we are trying to sneak in but a legitimate service animal...our dogs always wear vests unless it is reaaaally hot. Unfortuantely they are puffy so the vests aren't always easily seen!
BTW I don't know what the laws are in other states but in CA we have had to go through a very intense program that usually lasts 2-3 years depending on how yound the dog is and how quickly they pick things up! Canine Good Citizen Testing, obedience classes (usually once a week for the duration of training), and "field work" taking the dog to restaurants, theme parks, malls, trains, planes, and hotels. It really is a lot of work and not easy!
Hopefulyl this helps clear up any confusion or misunderstandings!