Synthetic drugs, an unknown grab-bag of toxic chemicals

Aired: 12/22/2015 | 0:07:42 | Clip
The synthetic drug Spice is known as "fake pot," but its effects are completely different from marijuana. The hard-to-detect substances are often made in foreign facilities with an ever-changing cocktail of chemicals, meaning you can never be sure of what you're taking. This year, poison control hotlines have seen a record number of calls across the country. William Brangham reports.