“Drug checking” refers to a harm reduction practice that involves testing substances to identify their composition and detect the presence of potentially harmful contaminants or adulterants. It aims to provide users with accurate information about the drugs they intend to consume, helping them make more informed decisions and reducing the risk of adverse effects or overdoses. Drug checking services may be offered at supervised consumption sites, harm reduction organizations, or festivals and events. These services typically utilize various methods such as reagent testing, spectrometry, or chromatography to analyze samples provided by individuals. By offering drug checking, harm reduction initiatives aim to promote safer drug use practices and minimize the associated health risks.