That's why it's a good day to drive drunk in Indep., MO today.
If the stated reason is lack of a valid driver's license, then any other evidence found or any other charge is inadmissible.
Dream on
You've got to be kidding, they'll bust you for whatever they find. Including an "unlicensed concealed firearm". Several years ago the scam was to set up "game check, checkpoints along I-80 in Nebraska at rest stops. Surprise, surpriser, in addition to game and parks rangers, they had DEA, BATF, State Patrol and other officers, just waiting to take your "business". In that case the main target was drugs, but they'd take what they could get.