This seemed brilliant to me, but it won't be happening... Green circles, blue squares and black diamonds have directed skiers for half a century, so why not use those same things to label weed edibles for potency? 

Colorado Ski Country, the trade-group representing the ski areas that host a majority of the nation’s skiers, doesn't want to share. In fact, they don't want anything to do with the marijuana industry.

Stakeholders in the edible marijuana world, retailers, manufacturers, health officials and child advocates, will soon issue all the rules for pot edibles in Colorado, but will have to come up with a different scale for potency. That is because Ski Country took its concerns to the statehouse and convinced lawmakers to add a quick sentence to legislation authorizing state regulators to develop a labeling system for edible marijuana.