Marijuana busts increased last year, with nearly 600,000 people being arrested on a possession charge—a staggering number that costs taxpayers billions of dollars even as the vast majority of Americans support legalization of the drug. 

The new arrest data, released Monday by the FBI, comes at a time when nearly 30 states allow the drug for medical use and eight have legalized it recreationally. 

“It’s really shocking in this era that these numbers are so high,” said Maria McFarland Sánchez-Moreno, executive director of Drug Policy Alliance. “It really makes you question why law enforcement is wasting resources and locking people up for personal use of marijuana.”

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