Award-winning journalist Sam Quinones tells the terrifying story of how the deadly new synthetic drugs plaguing the country have lead to mental illness and a surge in homelessness across the United States. Quinones has a fascinating book out on the subject called The Least of Us, which chronicles how designer drugs such as methamphetamine and fentanyl took the place of opiates such as OxyContin and heroin. The powerful drugs are more addictive and lethal than anything we've seen before. Quinones also offers stories of hope as communities come together to combat addiction.