Dose-Response Correlation for Drugs of Abuse

Is there a Dose-Response Correlation for Drugs of Abuse  

Do Different Physical Classes of Hair and Hair Care Habits 

A poor correlation between self-reported drug use histories of military members in drug treatment and the amount of drugs found in hair was observed when hair color was taken into account. The variability of drug incorporation along racial lines also has been observed by several other authors - for a limited population of individuals. Several variables such as hair texture and hair care habits could account for these differences. 

The binding of cocaine or morphine to ten different hair types. Hair type is not a well-defined term. However, it reflects hair color, hair history, race, and ethnicity of its donor. 

While the in vivo studies cited above suggest bias among hair types, these studies contained too few subjects to reach statistical significance, or these studies were based upon self-reported use, which may be inaccurate. Mieczkowski and Newel have 

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