We have so many laws that basically the legal system can find something wrong you've done, which makes everyone criminals. It's only a question of if they will charge you with it. You can't have a crime without a law, because a crime is when you break a law.
The war on drugs I would definitely say is crime expanding, as we are taking things that was legal, or more legal (even while dangerous or stupid) and are making them illegal. Now a substance abuse problem is also a criminal problem.
Same for three strikes, because many times you're taking a simple crime and over penalizing it. If the US's crime rate has been dropping so quickly, why do we have such a high prison population?
I also am not sure we're making that many new laws for violent crime. I think that is more or less well described.
And just because it's my favorite saying, "correlation is not causation!"