An expert witness is a person who is believed to have great knowledge relating to a particular subject as compared to an average person. They contain so much knowledge that people completely rely on them for their opinion regarding any issue. The expert witness is very helpful in determining the medical carelessness.

The function of expert witness testimony in medical negligence is mainly to set standards, identifying breaches in these standards and if there are some breaches giving an opinion. In addition an expert witness is also asked to test the current state of patient and provide help accordingly.

Courts mainly rely on expert witness testimony for setting up standards of care which are really necessary to a malpractice suit. Expert witness testimony in civil litigation is entirely different from other witnesses. In court cases, witnesses need to restrict their testimony to the main issue and compare the valid standards with the facts and check if there is some kind of deviation in the standard.

Environment toxicology is study which includes the effect of chemicals present in natural environment on the human body. It consist information relating to how chemical move in environment and influence biological systems. It’s mainly understanding of various toxic substances. Since the entering of various chemicals, affecting eco system has become a complex issue thus environment toxicology has become realty important.

There are various societies of environmental toxicology dealing with the environmental problem and their solutions. These societies are based on the development of principles of protection, improvement and management of environmental quality and integrity of ecosystem.