Only because you choose to remain ignorant of them.
tallhappy gave you, as an example, the article of this thread. In the article, the author gives a link to the court case. If you read the court case, you'd see the intent of the legislature.
"The dissent claims that the statute’s objective is to prevent people from driving under the influence of a controlled substance. Not so. The statute’s stated objective is to prevent persons from driving with any amount of a schedule 1 controlled substance in the body, whether or not the substance is still influencing them. This is clearly a legitimate exercise of the Legislature’s police power since 11-carboxy-THC is indisputably only present in the body after someone has ingested marijuana, i.e., done something illegal."
In other words, the Michigan legislature couldn't care less if marijuana is "influencing" you -- they simply don't want you driving after you smoked. That, to me, is a valid example of "actual Americans ... enacting laws that are going in the opposite direction."
This article. This example. This is pretty harsh and draconian. Comi8ng down on the stoners a lot more than anything I've ever heard of.