Absolutely.
But the "service animal" thing is easy to get away with. When I worked at Wal-Mart I was specifically briefed that if somebody said an animal of ANY type was a service animal, we could not question them. So someone could bring their pet in and say it was a service animal and we couldn't say boo.
To shed a little light, here's a bit from a FAQ put up by the FTA for bus drivers:
Question:
Where can I find detailed information regarding service animals and also if operaters are allowed to ask if an animal is service trained?
Answer:
Under 49 C.F.R. § 37.167(d) of the DOT ADA regulations, transit entities are required to permit service animals to accompany individuals with disabilities in vehicles and facilities. The DOT ADA regulations define “service animal” as the following: Service animal means any guide dog, signal dog, or other animal individually trained to work or perform tasks for an individual with a disability, including, but not limited to, guiding individuals with impaired vision, alerting individuals with impaired hearing to intruders or sounds, providing minimal protection or rescue work, pulling a wheelchair, or fetching dropped items. Service animals are animals that are individually trained to perform tasks for people with disabilities. A transit entity may ask if an animal is a service animal or ask what tasks the animal has been trained to perform, but cannot require special ID cards for the animal or ask about the person’s disability. A service animal may not be excluded unless the animal is out of control and the animal’s owner does not take effective action to control it, or the animal poses a direct threat to the health or safety of others. Assumptions about a how a particular animal is likely to behave, based on past experience with other animals, are not a factor. If an animal’s only function is only to provide emotional support or comfort for the rider, that animal would not fall under the regulatory training-based definition of a service animal. Simply providing comfort is something that animal does passively, by its nature or through the perception of the owner. With that said, nothing in the ADA prevents a transit agency from accommodating pets and comfort animals. Some do, and that would be a local decision.
From:
http://ftawebprod.fta.dot.gov/ContactUsTool/Public/FAQs.aspx?CategoryID=4Note that under the conditions listed, it would be entirely possible for a passenger to board with a "seeing-eye snake." This topic sometimes takes quite a while to work through with a group of new hires!
DD
(There is talk that the FTA will be adjusting their guidelines to only allow "common pets", excluding "farm animals" etc. Also, interestingly, there is a trend towards "service horses". Seems they are easily trained and quite effective. Oh, and here we're talking about miniature horses. I'm not sure how the FTA will address that if they change their guidelines.
See here for seeing eye horses:
http://www.guidehorse.com/)