We import a few 100 of them every winter.
They are very easy to keep and are one of the most laid back snakes you will ever find.
Out of 200 or so we brought in this season not a one offered to bite or musk, any thing.

They have a very triangular body with rough scales (hence the common name). This helps them grip their prey better as they are mostly reptile feeders in the wild.

In captivity they do well on a cypress mulch bedding with a big water bowl. The will take geckos, skinks, toads and other snakes readily. With a little wprk they will also switch over to rodents. One of the easier ways to switch them over is to offer a cold rat pup that has a little toad or lizard scent on it. Not only does it have the right smell but it also has the right texture.

They need a good worming with panacure and flagil when they come in as they are often stressed and that will make any parasite loads peak. Once they are treated and settle in they make great long lived interesting pets.

Hope this helps....