Users with smartphones scan the tags for more information. Like any barcode, QR codes are customized for a particular purpose, and most QR tags contain the URL of a Web page that promotes ...

Brazen drug dealers are targeting children near schools by trying to sell them cannabis – using QR codes on lampposts.

Stickers - showing a shiny marijuana leaf with a scannable QR code below - are being used to tempt "impressionable" kids to ...