The fact of the matter jnemonic is not much leaves South America over 70% these days, have posted this many times but the grandiose claims of "pure straight of the brick" still lure people into thinking they are buying pure cocaine. The cocaine is cut at source at point of manufacture with a variety of active and inert cutters/bulking agents, just because it is a brick means fuck all, something that seems to escape most peoples understanding of how the cocaine trade operates. By the time that brick has crossed a border or two and gone through the hands of several more transporters and sellers that 70% will be lucky to be 50%.