“Everyone is looking for one number. And it’s almost impossible to come up with one number.” As legal and medical marijuana sales continue to rise, legislators are looking for a simple way to know whether someone is driving while impaired. But it turns out that it’s really hard to test whether a driver is stoned. (Although if they do a second loop around the drive-thru, it’s a definite sign.)

+ Snoop Dogg, Willie Nelson, as well as the estates of Jimi Hendrix and Bob Marley, are all in the business. But it’s not just musicians who see the dollar signs associated with legal weed. Some record stores are looking to boost sales by selling vinyl and marijuana under the same roof.