The purpose of this paper is to throw some light on the adulteration a
nd dilution of illicit drugs, heroin, cocaine, amphetamine and ecstasy
in particular. The findings of the paper question common assertions t
hat street drugs are 'dirty' drugs full of dangerous and unknown quant
ities such as brick-dust, Vim, Ajar (domestic cleaning agents), rat-po
ison and even ground glass, as well as the logic of why such practices
should be thought to exist. Common adulterants and diluents (diluting
agents) are outlined and discussed and an understanding of them as es
sentially rational and relatively safe not unpredictable and life-thre
atening is put forward. It is further suggested that far less adultera
tion than is frequently believed to take place actually does so.