On July 1, 2018, marijuana will officially become legal in Vermont, but that doesn't mean you can take cannabis anywhere in the Green Mountain State. Despite the new law, marijuana will remain illegal on one prominent lake.

Unlike other waterways in Vermont, Lake Champlain -  the sixth-largest body of fresh water in America - crosses an international border with the Canadian province of Quebec. That means its waters are governed by federal, not state law. And since federal law still prohibits cannabis, anyone caught with marijuana on the lake is subject to federal enforcement.

Vermont isn't the only jurisdiction facing this sort of territorial conflict between state and federal law. National Parks are also governed under federal law, which means prohibition is still technically in effect in the 32,526,050 acres of Alaska that cover the state's National Parks. That's larger than Delaware and Rhode Island combined.

Meanwhile, since Congress oversees the municipal budget in Washington, DC, the district hasn't been able to set up a functional retail market for recreational marijuana even though residents voted to repeal cannabis prohibition back in 2014.

So until the feds come to their senses and repeal prohibition, cannabis consumers need to double-check these areas where federal and state law overlap before wandering about Vermont and the other legal states.

h/t The Post Star