council recommend march guidelin take sampl seiz drug council european union bear mind unit nation singl convent narcot drug amend amend protocol unit nation convent psychotrop substanc unit nation convent illicit traffic narcot drug psychotrop substanc european union action plan drug approv feira european council june council decis jha transmiss sampl control substanc guidelin repres drug sampl adopt european network forens scienc institut novemb object european union progress establish area freedom secur justic import area comprehens effect combat crime includ crime relat organis traffick drug term quot drug quot quot psychotrop substanc quot understood substanc list unit nation convent substanc subject control measur pursuant articl joint action jha june inform exchang risk assess control synthet drug collect analysi dissemin object reliabl compar data drug phenomenon assur laid european union action plan drug european union action plan drug consid member state forens scienc laboratori exchang inform analysi sampl collect synthet drug seizur end guidelin take sampl consider guidelin practic lead excess laboratori workload result unaccept turn time guidelin aim protect chain custodi transmit sampl view ensur admiss evid proceed drug relat crime guidelin matter improv judici decis judgement facilit work offici engag combat drug level recommend member state phase sampl seiz drug analyt purpos introduc system take sampl internation accept guidelin appli guidelin case result take sampl relev member state european network forens scienc institut guidelin novemb repres drug sampl good basi guarante procedur take sampl minimum standard sampl larg intern case detail report descript sampl sampl number weigh packag origin extern characterist appear pictur seizur law enforc author forens expert court sampl techniqu base hypergeometr bayesian method confid level proport level half item method recommend minimum standard sampl member state consider member state accord nation legisl adopt measur guarante chain custodi transmiss sampl oj oj