A chain of custody form is a document that tracks the sample through all procedures and changes of analyst during the collection and analysis
There are a number of ways that alcohol (ethanol) can be tested for. Breath alcohol can be tested for using a breathalyser. Blood alcohol can be measured, as well as urine alcohol. There are other biomarkers available to monitor alcohol/ethanol consumption, such as plasma CDT levels and urine ethyl glucuronide levels.
The detection window can vary for different drug classes. As a general rule of thumb, drugs are detectable for 2-3 days following intake. There are obviously some drug classes that remain for longer periods of time (i.e. cannabinoids) and some that are detectable for shorter periods of time (i.e. gamma-hydroxybutyrate).
Yes, you can ask for your sample to be re-tested. Under the Australian/New Zealand standard for workplace drug testing, samples are required to be retained for three months post testing.
Yes, some prescription drugs do react with the analyses we use. When filling out the chain of custody documentation, always write down all medication (both prescription and over-the-counter) being taken or having been taken in the previous week.
No, your employer will not know what medications you are on unless they are one of the drug classes being tested for and you return a positive result for your urine sample.
If your confirmatory test does not confirm the presence of the drug class indicated from the initial screening test then the report states that drugs were not detected.
The original sample is split to allow analysis of one of the samples while the second sample is held as a reference sample, available for analysis by an independent testing laboratory should there be a dispute over the initial testing.
The sealed ‘B’ sample is stored frozen at -20°C for three months. Should a result be challenged, then this sealed sample is available for analysis to confirm the original report.
No, the screening test cut-off value has been set to a level that excludes the chance of detecting cannabis from passive exposure.