No one should be permitted to opine pharmacodynamic effects of a multiple order kinetic drug based upon an analytical chemistry result alone.
This is because of the very interesting world of pharmacokinetics and the multi-variant problem of the human body and the human condition. The analytical chemistry result must be equated not simply to symptomatology, but uniquely to it, meaning that the use of the drug uniquely and to the exclusion of all other reasons produced the observations of the marked diminution of dexterity, marked diminution of cognitive function or marked diminution of psychomotor function.
Please read Attorney McShane’s blog post: False Conclusions and False Convictions: Attempts of Elucidating Pharmacodynamic Effect from an Analytical Chemistry Result-How Solely an Analytical Chemistry Result in a DUID Prosecution Cannot Scientifically Support a Conclusion of Driving Under the Influence of Drugs.
Please visit Attorney McShane’s blog to learn The Truth about Forensic Science