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Xylazine-Fentanyl Positivity and Concentration in Urine Drug Tests. 

Xylazine-Fentanyl Positivity and Concentration in Urine Drug Tests. 

Sugarman OK, Marks C, Whitley P, Saloner B, German D. 

JAMA Netw Open. 2026;9(7):e2622473. doi:10.1001/jamanetworkopen.2026.22473

https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2851452

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