I'd like to turn this around somewhat and find a study that shows just how many "productive", employed citizens are actually using prescribed opioids and ADD medicines (methamphetamines) that help them to work harder and longer hours, because my bet is that it would be at least a significant fraction.
My point? Maybe just because someone is taking opioids, people shouldn't automatically label them as unhireable.
People on suboxone and methadone would test positive for opioids as well...are these people also considered unhireable?