Those who "need to know" are now allowed to ask

IF the animal is a service animal

and

they may ask what task(s) the service animal does specifically for you.

Before this, they could only ask if it was a service animal and take someone's total word for it. I guess they figure (rightly so imo) that someone with just a pet can't come up with 3 tasks they have done for them by their pet, on the spur of the moment. (There will always be those who sneak past the law.)