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File - In this Friday, April 5, 2019, file photo, a customer takes a photo of large jars of marijuana from on display for sale at Rev-Up a cannabis marketplace in Los Angeles. California is trying a new strategy to cut into the state's huge illegal marijuana market. State regulators have proposed rules that would require legal shops to post their unique quick response code certificates in storefront windows to help consumers identify licensed businesses. Shoppers would use their smartphones to scan the familiar, black-and-white codes, similar to a bar code, to determine if a business is selling legal, tested cannabis products. (AP Photo/Richard Vogel, File)

File - In this Friday, April 5, 2019, file photo, a customer takes a photo of large jars of marijuana from on display for sale at Rev-Up a cannabis marketplace in Los Angeles. California is trying a new strategy to cut into the state's huge illegal marijuana market. State regulators have proposed rules that would require legal shops to post their unique quick response code certificates in storefront windows to help consumers identify licensed businesses. Shoppers would use their smartphones to scan the familiar, black-and-white codes, similar to a bar code, to determine if a business is selling legal, tested cannabis products. (AP Photo/Richard Vogel, File)

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