Nation What is ‘rainbow fentanyl?’ Reports of ‘deadly’ colorful pills and powder raise concerns August 20, 2022September 23, 2022Wyatte Grantham-Philips, USA TODAYComments Off on What is ‘rainbow fentanyl?’ Reports of ‘deadly’ colorful pills and powder raise concerns Reports of multicolored fentanyl pills have popped up across the U.S. Here's what you need to know about the deadly drug.