As the other person mentioned, that's probably not a good idea. The people writing the laws should know about the legal framework. They should understand a wide body of legal concepts, procedure, precedent, and the appropriate verbiage.

It also ties in with the fact that, like it or not, we need lobbyists. Sure, the system is broken, but legislatures can't be experts on everything. So, they need people to explain and even be able to get into the details. They need someone who is a domain expert.

That is, theoretically at least, why we have to have lobbyists. Legislatures should also have a good baseline knowledge of the legal system, with all the details that includes. They need to be very familiar with the legal system which makes lawyers potentially good legislatures.

Potentially... Like lobbyists, there's good and bad with the system. There is potential for good, as much as there is potential for bad. We seem to like to think we are in dire straits and that doom faces us constantly, but we are actually doing quite well. We're not perfect, but we aren't as bad off as the nightly news would have us believe.

Also, people really hate lawyers, until they need one. I'm not a lawyer but I have great respect for some of them.