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Aim of the Study: The aim of this study was to develop and validate a method for the determination of the synthetic cannabinoid AB-CHMINACA in blood, followed by its verification in forensic toxicological practice., Material and Methods: The case of a 41-year-old man admitted to hospital because of scheduled cardiac surgery was discussed. The man died after 12 hours of hospitalization. Based on collected evidence, AB-CHMINACA poisoning was suspected. The identification and determination of AB-CHMINACA in the man's blood was performed by high-performance liquid chromatography coupled with tandem mass spectrometry using electrospray ionization (HPLC-ESI-MS-MS), after prior solid phase extraction., Results: The concentration of AB-CHMINACA determined in the man's blood sample was 0.5 ng/ml., Conclusions: In the interpretation of the case, it was concluded that AB-CHMINACA had no direct effect on the patient's death, the cause of which was ascertained as chronic heart failure secondary to aortic valve disease, decompensated by pneumonia. However, an indirect impact of side effects resulting from the use of synthetic cannabinoids cannot be ruled out. They might have exacerbated the man's disease process leading to sudden cardiac arrest caused by asystole.