Coffee Break Training: Fire/Arson and Explosion Investigation Curriculum: Common Mistakes Made by Expert Witnesses [open pdf - 316KB]
"An expert witness is a person who is allowed to offer opinion testimony at trial based upon his or her specialized knowledge, training or experience, if the opinion is reliable, relevant to the issues in the case, and will help the fact finder to reach a decision. At some point in the course of their careers, it may become necessary for fire investigators to serve as expert witnesses to provide opinions in criminal and civil litigation with respect to the origin and cause of fires."
Coffee Break Training - Fire Investigation Series No. FI-2013-20
United States Fire Administration: http://www.usfa.fema.gov/