The liquid inside the test tube is neon green, the color of lime Kool-Aid or the mad-scientist potions found only in comic books. They are a mixture of marijuana and solvents, stirred together in a furious swirl by a lab technician wearing protective goggles and latex gloves. Running the concoction through a $70,000 machine, the technician can learn with scientific precision the plant’s unique chemical makeup, its potency, even its [...]