That's the most you'll probably get from the lawfuls I've encountered (no offense). Contraband is a hard issue, as there are three main types: OORP smugglers to Manhattan (IE the ones who dive past the battlecruiser lawfuls to quick dock), ones who smuggle large quantities to unlawful bases. The ones who smuggle small quantities to lawful bases are obviously not doing it for the cash, but the in-game scanner is a great metagaming tool. It doesn't matter if you had 30 different commodities, or 500:1 pharmacutical:cardamine/synth ratio, you'd still be told to drop it or die.
On my first flight, I had a single unit of Counterfeit software representing a dodgy Ship OS. Some lawfuls even wanted me to drop it, although I explained what it was. It seems that people only read the description, and don't leave their minds open to new ideas for the different commodities.