Identification of regular substance use from the one-off administration of a substance, differentiating normal (endogenous) levels from administration (exogenous).
Pre-test recommendations to inform your decision; allowing the correct choice for testing that can provide results to resolve investigations.
Donor declaration conflicts with the interpretation and conclusion provided. Can an alternative scientific reason and justifiable interpretation be provided?
Expertise to clarify and explain different test results from samples collected at different times or analysed at different laboratories.