Field drug test. Pink over blue determines that substance is cocaine. Crack cocaine in this case. Street Narcotics Unit KCPD Stock Photo - Alamy

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Fentanyl as a potential false positive with color tests commonly used for presumptive cocaine identification - Kosecki - 2022 - Journal of Forensic Sciences - Wiley Online Library

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Courts Are Beginning to Prevent the Use of Roadside Drug Tests — ProPublica

Inaccurate drug test lands Draper couple in jail for two and a half months

Cocaine test hi-res stock photography and images - Alamy

Cocaine test hi-res stock photography and images - Alamy

Fentanyl as a potential false positive with color tests commonly used for presumptive cocaine identification - Kosecki - 2022 - Journal of Forensic Sciences - Wiley Online Library

Cocaine test hi-res stock photography and images - Alamy

Street narcotics unit hi-res stock photography and images - Alamy