Hair testing is superior to urine to disclose cocaine consumption in driver's licence regranting

Forensic Applications of Hair Analysis

“…In seven subjects attending the Local Medical Commission for driving license regranting, with negative urinalysis over several months, hair analyses gave positive results for cocaine (0.51À2.23 ng/mg) and BE (0.08À1.70 ng/mg) in all the cases [88]. In seven subjects attending the Local Medical Commission for driving license regranting, with negative urinalysis over several months, hair analyses gave positive results for cocaine (0.51À2.23 ng/mg) and BE (0.08À1.70 ng/mg) in all the cases [88].…”

Chromatographic Methodologies for Analysis of Cocaine and Its Metabolites in Biological Matrices

“…However, for cocaine detection, there are some limitations, including limited window of detection, occurrence of false-negatives as a consequence of very low cocaine concentrations in samples, specific requirements for storage, possibility of sample dilution in vivo by excessive fluid ingestion, requirement of collection under observation to avoid adulteration or sample exchange, or even absence of urine specimens in postmortem cases (Cone et al, 1998;Cone et al, 2003;Musshoff et al, 2006;Polla et al, 2009). …”

Challenges in Drugs of Abuse Testing

“…A drug abuser needs to demonstrate that he or she is drug free before receiving an organ transplant. The authors concluded that hair testing is superior to urine testing for identifying occasional abuser of drugs (7) . The authors concluded that based on a 90 -day detection window for an illicit drug using hair analysis, two negative tests indicate 6 months of abstinence from any illicit drug (6) .…”