Why aren't the goverment doing something about these boa's/all the snakes from afar?

there shouldn't be ang snakes to be sold here in canada /US there already having a problem in the US that these snakes are taking over and adapting to our weathers. they belong in the wild . there was a guy the US ,Boston had his 2 year old got done in by his boa he just turn wild all these anmals have that in them and no matter what they cab turn on you like a flash.it not there fault it the way they are. they should be back where they come from. the laws no good if they don't do have the law.