 That's why driving high is illegal everywhere. So if you're high, just don't drive. Make a plan to get a sober ride. Because if you feel different, you drive different. Brought to you by NHTSA and the Ad Council. A fraction of a raindrop. Three grains of salt. Add up to 100 times more potent than morphine. The tiniest amount of illegal fentanyl is all it takes to cause an overdose.