"Heroin shows up in your blood and your hair and they mark it down against you. But hey, everybody’s brain has some lacrimogen. Lacrimogen’s a natural neurochemical. It’s a very vivid drug because it’s surveillance-proof. Sure, if you use too much lacrimogen, it’s a big problem, you get clinically depressed. But if you use just the right amount, lacrimogen really makes you a lot more aware."