Heads up to all: we just reported 8 positive findings of etorphine in urine, with concentrations between 2 and 10 ng/mL. Due to difficulties in obtaining new standard, we resorted to using the standard we had from circa 1987, maybe it came from a QA Set? We verified spectra etc. and also used the positive kit control from Neogen as additional supporting information. Perfect match in all. All findings were made using the Neogen Etorphine ELISA. Split sample testing inquiries should be expected…….please let us know if there is anything we can do in terms of sharing method etc.