"It's the hydra," Andy said. "For every twenty addicts they arrest they might catch one or two dealers, but the big guy, the spider at the centre of the web, is untouchable and he can easily recruit a few more people to sell the goods. Meantime the crazies are out to play, desperate to get their oblivion of choice." She glanced at the counter and the pink tea packets on display and added. "I've been hearing some odd things about that Karma Chai, for instance. Did you know you can smoke it?"