When hiring an expert witness, contact the expert personally. Determine that there is no conflict of interest and that they have the expertise necessary for your case. Also take into consideration that expert witnesses may be hired as consultants. For example, a toxicology expert witness can help you evaluate your case, assist in developing the case, educate counsel, and suggest experts to be hired to testify. They will be knowledgeable and can opine regarding toxic chemicals exposure, asbestosis, benzene, carcinogenesis, chemical burns, and chemical spills as well as provide reports on chemical toxicology, drug toxicology, and forensic toxicology.