Answers to Your Top Drug Testing Questions

Learn the answers to the most commonly asked questions on drug testing results fielded by our expert toxicology team.

Topics covered include:

  • False positive and false negative results
  • Positive drug test result interpretation
  • Metabolite detection in oral fluid specimens
  • Creatinine testing and specimen validity
  • Factors influencing urine drug concentration
  • Validity testing – dilute and substituted specimens
  • THC – new vs. old drug use
  • Ethanol/alcohol biomarkers – What’s the difference?


Presented by Damon Borg, Ph.D. F-ABFT, Senior Scientific Director and Director of Research and Development, Cordant Health Solutions.