Fentanyl shows up in places people don't expect it. It gets pressed into counterfeit pills made to look like Xanax or oxycodone, and it gets mixed into cocaine, heroin, and other street drugs. That means someone can be exposed without ever choosing to use it. Knowing what fentanyl use looks like matters because the drug is potent, and a reaction can move fast. When you can spot the signs in someone close to you, you have a real chance to step in before it becomes an overdose.