I recently read about a Denver City worker that got in an accident while working and according to policy had to take a drug test. Since he was a MMJ patient he, ofcourse, tested positive for THC.

Not sure of specifics, if the employee seemed "under the influence" while working but either way it will be interesting to see how it plays out.

Here is the link:

Denver Worker Blames Medical Pot For Accident - cbs4denver.com