An infrared spectroscopic approach to characterise white powders, easily applicable in the context of drug checking, drug prevention and on-site analysis, Deconinck, Eric, Ait-Kaci Camille, Raes Andries, Canfyn Michael, Bothy Jean-Luc, Duchateau Céline, Mees Corenthin, de Braeckeleer Kris, Gremeaux L., and Blanckaert Peter , Drug Testing and Analysis, 2021, Issue 13, Number 693, (2021)