Why would chams be illegal in MA??
They can have no impact at all on wildlife or anything else.
If they got loose, they would soon be dead thanks to MA weather
Folks, playing devil's advocate here;
Remember, chams and other exotics in some states are illegal to have
without a state permit. Doesn't mean you can't have them, just that the state wants you to register what you have and pay for the privilege. In some ways not much different for dogs or cats. Doesn't mean you can't have a dog or cat...just that they be licensed. States I've lived in that require permits for exotics usually have a list of species that don't need one...things that are really domesticated like parakeets, rats, or guinea pigs (some states still consider these common pets exotics!)
Sure it might be a revenue grab but usually these types of permits aren't very expensive. There might be some part of the state's livestock or fish and game department that benefits from these funds. I'll bet most of the reason has nothing to do with whether the species would be harmful if released, but rather that the state is trying to keep records (how many, to track public health issues with them, who brings them in, who breeds, etc) on exotics that are being bred or imported from other states. Don't get me wrong, I don't think they need to be so closely managed but I can see why a state could decide to require it.
I lived in NJ when I bought my first cham. Needed a $5 annual permit to have it and I got the permit application right at the shop during the sale. I also had to get permits for my 3 birds that I had when I moved there. Turned out to be a hassle for two of them, but the state biologist trying to help was pretty laid back about it. He admitted they weren't going to come after me if all the paperwork didn't get done.
It's a rather annoying little demand but what are you going to do about it really?