The drug war didn't give us anything but more dangerous drugs.
Adderall (fake or legit) is heavily sold illegally and their lacing with Fentanyl is a massive problem already.
It's just that fentanyl risk is more dramatic than those contaminants. Maybe one is "increase your risk of cancer over a couple of decades" or even "does not have intended effect" and the other is "stop your heart soon after consumption".