These common drug tests lead to tens of thousands of wrongful arrests a year, experts say. One state is fighting back

By Holly Yan, CNN (CNN) — Bird poop scraped off a man’s car appeared on a drug test as cocaine. A toddler’s ashes registered as methamphetamine or ecstasy. And a great-grandmother’s medicine tested positive for cocaine – spawning a 15-month legal nightmare, forcing her to refinance her home, and spurring a new state law that