I've read that some of these cases of other drugs laced with fentanyl are due to unintentional cross-contamination, due to people preparing cocaine for sale on

I've read that some of these cases of other drugs laced with fentanyl are due to unintentional cross-contamination, due to people preparing cocaine for sale on the same table or scales that they previously prepared fentanyl on and didn't clean properly, for instance.