ka50, I suspect that what you're talking about is the definition of the difference between
malum prohibitum and
malum in se.
If something is
malum in se, it is considered evil in and of itself - something inherently bad. For example, murder, rape, theft, etc. are all considered actions that are
malum in se, and laws prohibiting them are usually acceptable to all, on the grounds of common sense. (Yes, I know that the latter is often neither common nor sensible, but anyway...
)
If something is
malum prohibitum, it's considered forbidden because someone has decided that it's a bad thing - not because it is evil in and of itself. The speed limits are a good example. Some Government functionary has determined that a speed limit of 30 mph on this particular stretch of road is good: therefore, that limit is posted, and if you drive faster than that, you face legal consequences. This is not to say that you've committed an evil act by driving faster than the limit, but you'll still face penalties for doing so. Most gun laws fall into this category, as do most bureaucratic regulations.
I'm all in favor of reducing
malum prohibitum laws to the barest minimum necessary for the function of society. If something is
malum in se, then laws dealing with that issue should not be a problem. (Of course, one then hits the difficulty of what makes something
malum in se in the first place! If a religious concept defines something as
malum in se, such as blasphemy, it can hardly be put into a law that would affect those who don't hold to the tenets of that religion - but this has happened before in history, with unhappy results. The concept of
malum in se needs to be refined so as to refer to actions that are universally adjudged as evil or bad, and this is an ongoing struggle - witness the laws in some states against oral sex, cited in a previous post. There's nothing intrinsically evil about oral sex, but there are some religions or religious perspectives that consider it so, and that's how these laws got on the books. The religious would argue that oral sex is
malum in se, while secularists would argue that it's
malum prohibitum. Let the debate begin!
)