Yellowstone National Park is just hours away from the Colorado border, but a rising number of tourists are learning that even a small amount of marijuana is still grounds for arrest.

As reported by the Associated Press, the U.S. Attorney's Office in Cheyenne prosecuted at least 80 marijuana-related cases in 2014, up from 52 the year before. While many states are increasingly loosening marijuana laws within their borders, national parks like Yellowstone are still considered federal land, and pot is still illegal on the federal level. Routine traffic stops have led to park rangers finding miniscule amounts of marijuana inside visiting cars, the standard punishment of which is a $1,000 fine.

But not all the time.

Gary Godina, a Hawaiian artist who was visiting Yellowstone in October 2013, was pulled over for speeding and admitted to possessing three grams of marijuana, roughly enough for 4-6 joints. Godina was forced to spend the night in jail before pleading guilty to possession and paying a $1,000 fine. As The Denver Post notes, getting caught with marijuana at a national park, national forest, or national monument has a maximum punishment of a $5,000 fine—or six months in jail.

So, the lesson here is to stick to unmarked edibles.

John Hendrickson Deputy Editor John Hendrickson is the Deputy Editor of Esquire.com, where he oversees the site's 24/7 news operation as well as all politics coverage.

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