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Welcome to Consultox, Limited, a toxicology consulting firm established in 1985. Dr. Richard A. Parent, Principal and Consulting Toxicologist, is a doubly Board Certified Toxicologist with a firm foundation in chemistry and over 30 years of practice in the field of Toxicology. Consultox is a full service toxicology consulting firm providing support to litigants as an Expert Witness in Toxicology and to industry as an Independent Toxicology Consultant for projects involving product safety, drug impurities, risk assessment, and various agency product registration processes.

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Expert Witness Toxicologist

Richard A. Parent, PhD, DABT, FATS, RAC, ERT, is certified by the American Board of Toxicology and the Academy of Toxicological Sciences as well as the Regulatory Affairs Certification Board. He is a recognized Expert in Toxicology in France and the European Community. Dr. Parent has over 35 years of experience in Toxicology and Chemistry and has directed two toxicology laboratories, the combination of such affords him insights that go far beyond his fields of dual expertise. Read More

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Coal tar creosote is used extensively to preserve crossties on the railroad. Railroad workers have to handle these heavy wooden ties that are freshly coated with creosote. Typically, the railroad workers get creosote all over their hands and arms. The components of creosote are lipophilic in that they are soluble in fatty tissue and are stored in fatty tissue. They easily penetrate the skin and enter into general circulation in the body and are carried to critical organs resulting in organ specific mutations and increased risk of cancer.

Coal tar creosote contains over 200 components many of which are polynuclear aromatic hydrocarbons (PAHs). Several of these compounds are also present in cigarette smoke and are carcinogenic to man. One of the most studied multi-organ carcinogens in coal tar creosote is benzo(a)pyrene which has been known to increase the risk of cancer in man based on animal studies dating back to the 1970s. Although most of the components of coal tar creosote are not particularly volatile, benzene is also present in coal tar creosote and is readily inhaled during contact with creosote. Benzene is known to cause various blood dyscrasias including acute mylegenous leukemia.

Long-term exposure to coal tar creosote by contact with the skin greatly increases the risks of developing cancer in man. Workers handling railroad ties by hand should be protected from skin contact with the creosote and from inhalation of the volatiles in coal tar creosote.

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Dr. Richard A. Parent has given testimony in courts in the United States and Canada nearly 30 times, and he has been deposed over 120 in support of both plaintiff and defense. Cases cover a wide range of subjects: dramshop, diacetyl (popcorn lung), wrongful death related to methadone and carbon monoxide, personal injury involving ozone, carbon monoxide, benzene, sulfur dioxide, chlorine, 1,4-dioxane, alcohol, arsenic, and others. Dr. Parent has lectured on the requirements for the establishment of causation and the structuring of expert reports. Many redacted reports are included on this website for review. Read More


Dr. Richard Parent has assisted clients in areas of product safety relating to toys, cosmetics, household products, pesticides, OTC drugs, art supplies, and food additives (GRAS).  He has worked with appropriate agencies to meet requirements for labeling and warnings as well as creating material safety data sheets (MSDS) for various industrial products.  He has been involved in assessing risk in occupational situations where potentially hazardous substances are involved and preparing submissions in support of food additives in accordance with the GRAS procedures.  Of particular interest is Dr. Parent’s area of specialization in Inhalation Toxicology and his significant contribution to the field through the publication of his book, “Comparative Biology of the Normal Lung”, a well respected source of normal parameters related to lungs of various animal species, including man.

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