No tax stamp???
Throw the book at them!
Pot Stamp you’re asking for a Boston Pot Party LOL
They will, that’s the purpose of Nebraska’s drug tax law. Paying the tax offers no immunity to criminal prosecution so it’s kind of an IQ test. But if you get caught with pot and haven’t paid the tax, a whole set of other penalties apply with different standards of evidence, etc. Including fines and confiscation of your stuff. It gives LEOs another tool to get drug dealers with in addition to the criminal laws.