"Cocaine because of its production process can never be pure but purity as high as this, over 70 per cent, puts Jamil Hussain close to the original supply and that, as I understand it, is why high purity is set out in the guidelines as an aggravating factor."
"The Home Affairs Committee inquiry into the cocaine trade noted the emergence of a two-tier market, whereby the majority of street-level seizures in 2008/09 were of 10% purity or less, but with some containing as little as 5%, with lower-quality cocaine having become available to a new market of consumers previously unable to afford the drug (Home Affairs Committee, 2010). As noted above, this is highly likely to be a consequence of and a contributory factor to the observed increase in the prevalence of use and the changed demographic profile of users. As shown in Figure 6, the existence of a two-tier market is supported by more recent analysis of cocaine powder seized within the ‘middle market’ which found that the purity level for most seizures was either at or above 70% or below 30%, with levels around 15–20% being the most common and as many as one in ten being lower than 10% purity (NCA, 2014 – see Figure 6)."