Did you know that the illicit fentanyl drug supply is increasingly being laced with other substances? A new NIST study tracks supply changes over time and across different regions of the U.S., providing information that could save lives. 🔗 ↧ NIST Study Shows How the Toxic Substances Mixed Into Fentanyl Vary ... Alerting first responders and law enforcement to the presence of these dangerous chemicals in local supplies of fentanyl can help save lives.