Cocaine measurement, urine

Cone EJ, Sampson-Cone AH, Darwin WD, et al: Urine testing for cocaine abuse: metabolic and excretion patterns following different routes of administration and methods for detection of false-negative results. J Anal Toxicol 2003; 27(7):386-401.

Preston KL, Epstein DH, Cone EJ, et al: Urinary elimination of cocaine metabolites in chronic cocaine users during cessation. J Anal Toxicol 2002; 26(7):393-400.