As already pointed out in another comment, don't volunteer that you have pot on you. At least make 'em work for it. Oh, you were thinking they were going to go easier on you? It doesn't work that way. On the one hand, yes, current marijuana laws in most states and at the federal level are ridiculous and unproductive. On the other hand, as a Washington resident what do you think I left at home on a recent motorcycle t…
Can you get in trouble for lying to a police officer?
"I respectfully decline to answer your questions."
"I prefer not to answer."
Also, I have to wonder if the guy was under the influence at the time if he handled his wallet in a way that showed the officer the marijuana card. (Or are they bright orange or something?)
Hand over just your license, registration, and insurance. Keep your wallet in your pocket.