Selectivity and sensitivity of urine fentanyl test strips to detect fentanyl analogues in illicit drugs Posted on January 4, 2022January 4, 2022 By Becky Carter Marianne Skov-Skov Bergh, Åse Marit Leere Øiestad, Michael H Baumann, Inger Lise Bogen Int J Drug Policy; 90:103065; 2021 Access article Chemistry, Seized Drugs/Controlled Substances, Toxicology