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Morgan Hill—an upscale suburb of San Jose, California—has banned marijuana dispensaries. So the prospect of delivery vans—akin to those operated by online retailers—coming into town has Police Chief David Swing concerned.

Swing is opposed to a proposal that would allow marijuana businesses to send home-delivery vans into communities where retail stores are prohibited, according to the Los Angeles Times.

"This will make it easier and more lucrative to rob a delivery person than a liquor store," Swing said, noting that under the proposal, delivery drivers would be allowed to carry up to $10,000 in cash.

"Robberies are the tip of the iceberg. They can lead to other crimes, including aggravated assaults and homicides," Swing said.

Proposition 64 bars the state from issuing a license to pot shops that have not been given city approval to operate. But city council members throughout the state say that authority is undermined if deliveries are legal statewide.