Assessing the real-world performance of xylazine test strips for community-based drug checking in Los Angeles. - Molina CA; R Friedman J; Koncsol AJ; Romero R; Godvin ME; Nuñez L; Pang KG; Tasini T; Okonkwo E; Vu M; Smith J; Shover CL (Harm reduction journal, 2026)