Environmental toxicology includes the study of scientific effects on the organisms, which the anthropogenic compounds may have once released in the natural environment. Generally, environmental toxicology mainly includes the study of the direct effects of the environmental chemicals on the human beings. It also aims in determining that how environmental pollutants interacts with the cellular functions and further gives rise to the long lasting complicated health effects within vertebrates as well as humans. It specifically includes the securitization of the toxic effects, which targets the reproductive system, hormone system and even the early brain development in the vertebrates. Enzyme catalyzed activation within target tissues and cells and receptor medicated responses are the main areas studied.

The assessment of environmental effects of chemicals is a bit complicated because it depends upon the organisms tested as well as involves not just the toxicity of a solo chemical, but their interactive effects including synergetic ones, mutagenicity, immunotoxicity and genotoxicity testing as well.

An expert witness testimony can provide a few medical opinions related to the causation, health effects as well as the future medical monitoring in regard with chemical and toxic exposures. In cases of degree of insanity, cost of care, loss of wages, the expert witness testimony is a very crucial source of getting information. A judge or the lawyer might call the expert witness over the case. During the event of insanity plea, the expert eyewitness testimony is always almost relied upon. They then pass on that information to the jury and the judge through means of their testimony in the court.