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From: Robert Swotinsky MD
Password: orange
Date: 30 Nov 2006
Time: 15:02:23 -0800
Remote Name: 71.192.169.78
A 1985 study presented urine benzoylecognine pharmacokinetic data, including the figure copied below. Note that this figure is micrograms per mL; to convert to nanograms per mL, multiply by one thousand. The level you reference represents use within the past 2-3 days. As to how much use, it depends on a variety of factors, especially the timing. Please note that no-one else has published this kind of data, perhaps because it's common understanding that correlating urine levels to use is at best a very rough approximation.
Source: Ambre J. The urinary
excretion of cocaine and metabolites in humans: A kinetic analysis of published
data. JAT;1985:241-5.