AB-PINACA pentanoic acid metabolite is primarily used in forensic and toxicological studies to identify and confirm the presence of AB-PINACA, a synthetic cannabinoid, in biological samples. It serves as a key biomarker in urine or blood tests to determine recent use of AB-PINACA, aiding law enforcement and medical professionals in cases of drug abuse or overdose. Additionally, it is utilized in research to understand the metabolic pathways and pharmacokinetics of synthetic cannabinoids, contributing to the development of detection methods and safety assessments.