Article Photos: Marijuana legalization raises safety questions 4/6

This photo taken on Friday, Jan. 4, 2013, shows a lab technician loading a tray of marijuana samples into a Chromograph at CannLabs in Denver. The Chromograph analyzes the samples and reports their chemical content and strength. From potency standards to labeling requirements and even regulations about pesticides and fungicides, marijuana production is largely unregulated, for now. That's why there are places like CannLabs in south Denver, where medical marijuana dispensaries and consumers can voluntarily have their marijuana and pot-infused edibles tested. (AP Photo/Ed Andrieski)