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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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The contamination of drinking water in Flint, Michigan, is a disaster of massive proportions. Considering the fact that children have been exposed from the time that they were conceived in the womb to their birth and development represents a template for numerous neurological and developmental problems. Exposure from drinking water consumed by the mother while the child is still in the womb coupled with direct exposure of the neonate via drinking water and foods cooked in contaminated water results in exposure during the most critical period of a child's development.

The first three years of life is a period of incredible growth in the neonate. By age 3, the brain has grown dramatically producing billions of cells and hundreds of trillions of connections, or synapses, between these cells. Many of these developmental processes can be altered by the presence of lead in brain tissue.

Thus, children are the most susceptible to the toxic effects of lead. Lead is passed from mother to fetus and neonate via transplacental transfer and mother's milk. From fetus to neonate to young child, lead is accumulated faster in children than in adults, resulting in serious neurobehavioral problems, delayed developmental effects, and mental retardation. Lead is distributed to the brain, liver, kidney, and bones. Lead also disrupts hemoglobin formation causing anemia. Currently, no safe level of lead in a child's blood has been identified, but a level of 5 /dl is considered a good guideline for maximum lead levels in children; however, there are scientific studies showing adverse effects at blood levels of less than 5 /dl. In assessing the potential causal relationship in lead cases, we must be certain of the source. In the case of contaminated drinking water in Flint, Michigan, there is no question of the source.

National Institutes of Health Update:

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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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