Not to be difficult, but cats should then be banned also. They are left to run free by irresponsible owners and become feral quite easily, are born hunters, and do real damage to the local indigenous animal population. Luckily, snakes movements are governed by climate. Cats live through most any conditions and breed like crazy. Don't get me wrong, I love just about any pet, and have had all kinds of "exotics". I just wish owners would donate them to a zoo, or a herpetlogical society.
I've owned several boa's, raised from babies, each reaching the 7-8 foot range, which I rarely caged once they hit 3 feet or so. When I couldn't find them, in the winter, I would shut down the heat and put a little heater in a steel milk crate. Never took long before they showed themselves. Summertime, crank up the a/c and do the same. A caged bird always works, and then they get a treat, too.
Sometimes I didn't have to do anything but have some people over. You'd always hear the initial scream.
DISCLAIMER! Everyone who came to my house knew I had them. I would NEVER try to freak the living s/!t out of anyone when snakes are such a common and instinctual fear for the public in general.