LOS ANGELES (AP) – 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 a unique black-and-white code in storefront windows to help consumers identify licensed businesses. Shoppers could use their smartphones to scan the familiar, boxy label known as a QR code to determine if a business is selling legal, tested cannabis products. California kicked off broad, legal pot sales in 2018. But the illegal market has continued to flourish, and rogue shops are a common sight in Los Angeles and other cities.