Credit: The American Chemical Society

Synthetic drugs such as "bath salts," "K2" or "Spice" have made unsettling headlines lately, with reports of violent, erratic behavior and deaths after people have used the substances. Why are these synthesized drugs so dangerous, and why aren't there more regulations?

In this week's Reactions, we answer these questions by examining the chemistry of two kinds of : and synthetic marijuana.

Check out the video here: