Check the listing for details. TN Scientific FYL & XYL Drug Test Strips [100Pack] Powder, Liquid, & Urinalysis. Condition: New. Listed at 174.99 USD. Fentanyl & Xylazine is increasingly showing up in the unregulated drug supply—often mixed into opioids, benzos, or stimulants without the user’s knowledge. TN Scientific Fentanyl & Xylazine Test Strips provide a fast, simple, and reliable way to check powders, pills, or liquids for the presence of xylazine before use. Trusted by harm reduction programs, outreach workers, and individuals across the country, these strips are designed to support informed decision-making and reduce the risk of unexpected exposure.Fentanyl & Xylazine is increasingly showing up in the unregulated drug supply—often mixed into opioids, benzos, or stimulants without the user’s knowledge. TN Scientific Fentanyl & Xylazine Test Strips provide a fast, simple, and reliable way to check powders, pills, or liquids for the presence of xylazine before use. Trusted by harm reduction programs, outreach workers, and individuals across the country, these strips are designed to support informed decision-making and reduce the risk of unexpected exposure.