U.S. Postal Service mail vehicles sit in a parking lot at a mail distribution center on February 18, 2015 in San Francisco, Calif.

Published May 24, 2018 at 2560 × 1706 in Deadly Delivery: Opioids By Mail

U.S. Postal Service mail vehicles sit in a parking lot at a mail distribution center on February 18, 2015 in San Francisco, Calif.