About

Andrew D. Ewens, PhD, DABT
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PhD in pharmacology
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Since 2004​
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Board certified toxicologist
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American Board of Toxicology
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Since 2009
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>20 hours continuing education/year
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Biomedical science experience
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Since 1994
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15 years as government contract toxicologist
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National Toxicology Program
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National Institute of Environmental Health Sciences
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Centers for Disease Control and Prevention
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National Cancer Institute
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National Library of Medicine
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Environmental Protection Agency
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10 years of institutional research experience
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Developed curative immunotherapy for cancer in mice
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Developed a technique to detecting genetic damage
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Clone NAD(P)H:quinone oxoreductase enzyme
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Developed structure activity relationships of taxane-induced Pgp inhibition
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Developed method to measure Ran GTP binding protein activity
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Characterize tetramerization site of GlpR protein
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​Independent research
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Since 2011
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Conducting studies on SDST/DRE evaluations
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Conducting studies on CBD oil
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Conducting studies on mouth alcohol
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Conducting studies on “alcohol” smell on the breath
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Building a liquid chromotagraphy/raman spectroscopy instrument
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Conducting studies on bias of interpreting drug testing results
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Expert witness experience
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Since 2014
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Testifying
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Since 2015
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Qualified for
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Toxicology/Pharmacology
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Drug use​
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Drug-induced impairment
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Drug-induced death
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SFST/Impairment detection
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Drug-induced impairment​
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Breath alcohol detection
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Drug use​
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Drug-induced impairment
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Qualified in
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United States
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CA, CO, Federal, MD, MI, MT, NC, OR, TX, VA
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Internationally
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Norway
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