This one seems pretty reasonable - according to the article, the cops pulled him over for swerving lanes (driving unsafely on public roads in a reasonable thing to want to police), and then discovered that he was driving on a suspended license, which he admitted to (it's reasonable to have a system for suspending peoples' drivers licenses that is enforced by the police). The police find the pill bottle and don't believe him when he tells them it's a legitimate drug, then "conduct[..] multiple field drug tests, which produced a positive result for fentanyl. Getchius was taken into custody and transported to the Greenwood County Detention Center. Shortly after, another drug test was completed and returned positive results for cocaine."
So it wasn't just the pill bottle, it was multiple other drug tests. I think you could make a reasonable argument that drug use shouldn't constitute a crime in and of itself - although it probably should if you're driving a car, for legitimate traffic safety reasons, I don't find DUI laws objectionable. Or you could make an argument that the criminal justice system shouldn't interfere with peoples' decision to use and sell drugs. I'm sympathetic to this myself, but I think especially in the case of opioids like fentanyl, the situation where government paternalism makes it illegal to sell opioids probably discourages enough destructive use of these drugs by unwise or already-addicted people that it's still net-positive in terms of human welfare. I suspect a society where it was simply legal to use and sell opioids would have a lot more human suffering in it than our own (possibly because in the absence of laws banning open opioid dealing, people who are close to severe opioid addicts might simply commit vigilante murders of suspected opioid dealers, and be left unconvicted by sympathetic juries). And once you hold the position that it's legitimate for the government to legally restrict the sale and use of these drugs, then you necessarily have to have something like police and something like a criminal justice system that investigates whether a person might be actually using and selling opioids and then lying about it.
The fact that the guy was in fact once addicted to some drug and "was working at rehab and addiction centers in Florida at the time of his arrest." is additional evidence that he might have returned to drug use, and there's no way to make cops who investigate opioid-related crimes not think this.