That disappeared when an act no longer had to be malum in se to be a a crime and intent to commit the act was required for a conviction.
No one can know what the law is any more, which is itself a violation of due process. Our legal system deserves very little respect. Jury nullification on a massive scale is what is needed.
"It will be of little avail to the people that the laws are made by men of their own choice, if the laws be so voluminous that they cannot be read, or so incoherent that they cannot be understood; if they be repealed or revised before they are promulgated, or undergo such incessant changes that no man who knows what the law is today can guess what is will be tomorrow."
-- James Madison, Federalist no. 62, February 27, 1788