An Unusually High Cocaine Blood Concentration in an Impaired Driving Investigation

Area of Science:

• Forensic Toxicology
• Drug-Impaired Driving Analysis

Background:

• Driving under the influence of drugs (DUID) cases frequently involve illicit substances like cocaine.
• Interpreting blood drug concentrations requires careful consideration of administration routes and case specifics.

Observation:

• A suspected drugged driver presented with unusually high whole blood cocaine (3.000 mg/L) and benzoylecgonine (1.600 mg/L) levels, alongside methamphetamine (0.260 mg/L).
• The driver admitted to swallowing cocaine during the traffic stop, explaining the elevated cocaine metabolite levels.
• The methamphetamine concentration surpassed Nevada's legal limit for operating a motor vehicle.

Findings:

• Despite the high cocaine levels, the driver could not be charged with cocaine DUID due to the circumstances.
• The motorist was successfully prosecuted for DUID based on methamphetamine presence and admission of use.

Implications:

• This case underscores the critical role of integrating case history with laboratory findings in DUID investigations.
• Jurisdictional statutes and driver admissions are vital tools for prosecuting drug-impaired driving offenses.
• Forensic practitioners must consider diverse drug administration methods and their impact on toxicological results.