The U.S. Drug Enforcement Administration will begin using emergency measures to categorize new fentanyl-like drugs as controlled substances, an effort to keep up with the rapidly evolving permutations of the powerful opioid drug.
A 1986 law, the Federal Analogue Act, allows the government to temporarily classify so-called "designer drugs" as illegal in order to keep up with chemists who make small changes to a drug's molecular structure in order to get around drug laws.