In what’s being called the biggest drug bust in the city’s history, agents with the U.S Drug Enforcement Administration have seized about 1 million fentanyl pills from a home in Inglewood, California.

The pills, which have a street value of between $15 million and $20 million, were designed to look like anything but fentanyl, which is 100 times stronger than morphine, says DEA Agent Bill Bodner. “The deceptive marketing coupled with the ease of accessibility makes these small and seemingly innocuous pills a significant threat to the health and safety of all our communities,” Bodner says. “A staggering number of teens and young adults are unaware that they are ingesting fentanyl in these fake pills and are being poisoned.”

Authorities believe the home was being used as a stash house by Mexico’s Sinaloa Cartel. It’s unclear if any arrests were made.