A person lights up a 28 ounce blunt at exactly 4:20 p.m. as thousands gathered to celebrate the state's medicinal marijuana laws and collectively light up at 4:20 p.m. in Civic Center Park April 20, 2012 in Denver, Colorado. Today, Colorado became the first state to allow marijuana sales to anyone over 21 years old.

Starting today, Colorado will become the first state to begin allowing the sale of marijuana to anyone over the age of 21. Recreational use has been legal in the state for about a year now, but today the plant will be officially available at stores with special liscenses. And, where there's a crop, and retail stores to sell that crop, there's a tracking system -- as in RFID tags. Not an alien concept to the world of retail. Some of these tags have a strap that you can attach to the plant. Each plant gets tagged, each tag has a number, and each number goes into an large online database. The Marijuana Inventory Tracking Solution or as Julie Postlethwait, an officer with Colorado's Marijuana Enforcement Division, calls it, MITS.

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Ben Johnson is the host of Marketplace Tech.

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