Do you know what type of science and analytical procedures are being used in your drug cases?
In cases where drugs are being analyzed usually the labs will narrow the search using presumptive testing techniques. If a sample tests above the cutoff level the lab will then move on to confirmatory testing for the drugs that tested positive in the presumptive test. Presumptive testing can give false positives, confirmatory testing is a MUST. This is done either for solid drug analysis or analysis of drugs in testing of biological fluids such as blood or urine. The scientific methods used for confirmatory testing is gas chromatography and mass spectrometry.