Searching out some awesome smoke spot on vacation this weekend? Be careful, Yogi.

The California chapter of the National Organization for the Reform of Marijuana Laws warned its followers in an email Wednesday that “since medical marijuana isn’t recognized by the federal government, a medical note or card won’t protect you on federal park or forest land within California.”

“That means Yosemite, Sequoia, Joshua Tree, Death Valley, Marin Headlands…and all national forests (Angeles, Los Padres, Siskiyou, Six Rivers…),” NORML advises.

And legalization in Colorado and Washington won’t protect you there, either.

“Once again this year, we’re getting a few reports of people being pulled over by rangers for minor traffic pecadilloes, and if the car smells like pot, they’re searched and cited for federal possession of a controlled substance. People have also been stopped on trails.”

CalNORML has a handy FAQ for folks who want more info. We recommend sticking with trail mix.