For several years,the misuse of stimulant substances is increasingly observed both in the field of sport,to improve the functions of the body and therefore to be more performant,and also by non-athletes to make life more tolerable on a daily basis.Adrafinil,2-((diphenylmethyl)sulfinyl)-N-hydroxyacetamide,is a drug designed for the treatment of narcolepsy by promoting an awakened state,and to treat alertness and neurological symptoms in the elderly.It is primarily metabolized in vivo to an active form,i.e.modafinil,2-((diphenylmethyl)sulfinyl)acetamide.The World Anti-Doping Agency(WADA)banned these two drugs in sports in 2004.The authors report an authentic case involving adrafinil and modafinil.The laboratory was requested to test for adrafinil in a hair strand collected from a woman found in posses-sion of vials of adrafinil and suspected of trafficking.A specific method was developed by liquid chromatography tandem mass spectrometry(LC-MS/MS).Unlike modafinil(varying from 6.8 to 13.9ng/mg),adrafinil was not identified in the strand.The interpretation of the results was difficult because this is the first case describing human hair analysis.In order to be able to interpret the results,a self-administration study was conducted after an oral administration to a volunteer(200 mg)whose beard hair was collected 10days after adminis-tration.The analysis of this specimen highlighted the presence of adrafinil at 0.8ng/mg and modafinil at 0.5 ng/mg.These results demonstrate the dual identification of both compounds after a single consumption,even after administration of a low dose.According to these results,the analysis of the hair strand from the authentic case does not match with a con-sumption of adrafinil,in accordance with abuse of modafinil alone.Intelligence considered that this was a trafficking case of adrafinil,with no self-consumption.