In the laboratory studies we've done where we acutely dose people with different routes of administration, I think it's important to note that when we give people smoked cannabis versus edible cannabis, the magnitude of drug effects and the types of effects are identical. It's really just the differences in the time course of the effects. I have not seen any evidence that eating it is more dangerous than smoking it, and I would disagree on the argument that you can't perceive the intoxication when you eat it. People are very aware that they're intoxicated.
The challenge is in detecting edible cannabis in a driver who is impaired versus not, but that's a problem across the board independent of route of administration. It is a little different in edibles, in that you get lower blood concentrations.