The problem is they will be carrying a combination of parasites and one type of treatment might not do for them all.
There was a run of these both in British and American shops a couple of years ago from what I remember. A few people came on here to get advice on their 'garter' snakes (they were generally sold a plains garters - Indonesian garters in Britain).
Negative results ... I've only heard of a handful of people that managed to breed them here in Europe but I've not met anyone that has a CB, leading me to think that they don't thrive in general and that parasite loads will pass from one generation tyo the next.
Without being able to feed their natural prey-types it seems to be extremely difficult to keep a natural equilibrium in their systems.