Sitting in his office in Baltimore, neurochemist Michael H. Baumann eagerly flipped through a spreadsheet. It listed hundreds of chemical names of suspected drugs seized by local, state, and federal law enforcement agencies over the past three years. "When police bust people with some white powder or a baggie full of pot-looking material, it gets sent to forensic laboratories, and they test what's in it," he says. All of that data gets dumped into a database cataloged by the Drug Enforcement Administration (DEA), and Baumann asks for a rundown of what's been found.