Is "invention is the mother of necessity" reality when it comes to laws?

For example, when it comes to illicit drugs, guns, whatever, through new and emerging laws, does this phrase actually push the fringe? Basically, if drugs were illegal, for example, would you have the plethora of designer crap out there? If no assualt weapons ban had taken place, would you have seen innovation in the form of thumb hole stocks? So basically, do laws actually do more harm than good in some instances? Interesting to say the least...