Marijuana has been illegal in the United States ever since it was discovered that hemp would threaten multiple industries. Everything is slowing changing, however, with more and more states making it legal to use for medical reasons and a few even legalizing for recreational use just like alcohol. The problem is that there is no convenient way to test for usage on the side of the road. Normally, if police suspect usage of the drug the haul you off for blood, saliva, or urine testing. Some officers can do urine testing on the side of the road, but that’s a huge hassle and can be difficult. Now, there’s a device in the works over at Shan Xiang Wang’s lab at Stanford University that could change the THC testing game forever.