A judge is capable of saying the law is improper, you're not guilty, but a judge isn't capable of criminalizing conduct which the law doesn't make criminal, no

A judge is capable of saying the law is improper, you're not guilty, but a judge isn't capable of criminalizing conduct which the law doesn't make criminal, no matter how obvious it is that they did something wrong. For example, a drug dealer who walked because the state law misspelled the drug. A one character error but it was a perfectly valid chemical name, just not the one they intended to make illegal.