National Toxicology Specialists, Inc. was formed in 1995 by Howard Taylor, PhD. He decided that drug testing is very personal and therefore requires personalized attention. To that end, he recruited two highly respected professionals to round out the management team. Together, we have the expertise to manage any aspect of drug free workplace management.

See for yourself:


Howard Taylor, PhD is a nationally known board certified toxicologist with over 30 years experience in drug testing. He is board certified by the American Board of Forensic Toxicology (ABFT) and the American Board of Clinical Chemistry (ABCC) with a subspecialty in toxicology. Dr. Taylor is a SAMHSA (formerly NIDA) laboratory inspector. He has published 30 peer-reviewed articles, 13 book chapters and 2 books throughout his career. His animated trainings and expert witness testimony are in much demand all over the country.


Greg Elam, M.D. is certified by the American Association of Medical Review Officers. He has clinical experience in dealing with controlled substance disorders and has supervised the review of over two million drug tests. He brings a very professional and personable approach to the review of drug tests. The first interaction with someone knowledgeable about substance abuse disorders is likely with the MRO. Therefore, the MRO interview sets the tone for future interactions, giving the MRO the opportunity to provide a positive approach to a shame based condition. Dr. Elam epitomizes the professional but compassionate physician in dealing with drug test issues.


Tim Shoaf, MBA, MT(ASCP) received his MBA from Vanderbilt University and has 28 years experience in drug testing and toxicology. Most recently, he served as Director of Operations for a SAMHSA certified forensic drug testing laboratory. Mr. Shoaf’s knowledge of business and toxicology makes him unique in the drug testing world. With his contributions, NTS has all the expertise under one roof so clients can literally call one number for all their drug testing needs! 


The NTS team has implemented and/or managed nationwide drug free workplace programs together since 2001. We are well suited to partner with companies having multiple locations spread throughout the country. Multiple location management requires a more personalized service in order to maintain as much consistency and uniformity as possible. Our team provides Superior Personalized Service!

NTS is well known for personalized customer service since we treat our customers as we want to be treated with satisfaction guaranteed. We personally greet you on the telephone, and we use no impersonal automated telephone attendant. Our staff is always accessible to provide assistance at any level. We have implemented very complex programs across the country, and our clients give us high praise for our willingness to exceed their expectations. Because we are thoroughly familiar with your needs and the importance of personalized customer service, you will be completely supported in all aspects of implementing and maintaining your program.