Comments on "Validated, non-destructive and environmentally friendly determination of cocaine in euro bank notes" by F.A. Esteve-Turrillas, S. Armenta, J. Moros, S. Garrigues, A. Pastor and M. de la Guardia. J Chromatogr A. 2006 Mar 10; 1108(2):285-6; author reply 287-8.