1. Toxicologist, William T. Lowry, Ph.D., Inc., 733 B North Fielder Rd. Arlington, TX 76012, US.
2. Engineer, Tire scientist/president, and engineer/vice president, respectively, McDowell Owens Engineering, Inc., Kingwood, TX, US.
3. Certified chemist/president and senior chemist, respectively, Armstrong Forensic Laboratory, Inc., Arlington, TX, US.
4. Environmental chemist, Institute of Forensic Sciences, Dallas, TX, US.