How Safe Is Colorado's Legalized Marijuana?

DENVER (CBS News) - It has been seven weeks since Colorado made history by becoming the first state in the country to legalize recreational marijuana, but the demand is greater than expected and the supply can come with surprises of its own.

Four years ago Genifer Murray turned a degree in microbiology into a career testing cannabis and started CannLabs. Their equipment looks like it could be found in any testing facility, but the state-approved machines are testing legal marijuana for contamination.

Murray told CBS News reporter Barry Petersen that her labs have found mold, mildew, E. coli and Salmonella.

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