Actually, even if the coke from columbia is not cut before we get it, the purity has, in fact, declined since 1998, when it was the purest according to the DEA.
In 1998, the cocaine was about 86% pure straight from Columbia. In 2001, the purest samples were about 77% pure.
Again, this is straight from the DEA, and is actually corroborated anecdotally.
Nowadays the average purity is below 75%, and that is the PUREST sampled, straight out of Columbia, no steps, says the DEA.
Those of you who think you have done 90% pure coke are mistaken.