J M Oyler

Sweat testing for cocaine, codeine and metabolites by gas chromatography-mass spectrometry.

M. Huestis, E. Cone, E J Cone, 1999, Journal of chromatography. B, Biomedical sciences and applications.

Comparison of heroin and cocaine concentrations in saliva with concentrations in blood and plasma.

E. Cone, A. Jenkins, E J Cone, 1995, Journal of analytical toxicology.