Xylazine-Fentanyl Positivity and Concentration in Urine Drug Tests
Jose Luis Vazquez Martinez
-
Source: Sugarman OK, Marks C, Whitley P, Saloner B, German D. Xylazine-Fentanyl Positivity and Concentration in Urine Drug Tests. JAMA Netw Open. 2026;9(7):e2622473. doi:10.1001/jamanetworkopen.2026.22473 Key Points Question How are the presence and concentration of xylazine with fentanyl changing...