In trial, experts are individuals who have specific knowledge about their field beyond what the average person would have. That knowledge could be about a broad, technical field such as neuroscience or it could be something as simple as a neighbor who constantly watches the happenings in the neighborhood. As a result of their experiences, those individuals have special knowledge that they are able to share with the judge and jury at a trial.
However, in order to allow an expert to testify at trial, there are certain criteria that must be met. Recently, thanks to a State of Louisiana Third Circuit Court of Appeals case, those requirements have been spelled out explicitly. The case involved the death of a teen as he was driving down a slippery highway in the evening on Highway 102 in Jefferson Davis Parish. He lost control of his vehicle as he was driving around a curve and the vehicle struck a headwall of a cement culvert that ran under the roadway. The vehicle rolled over into the ditch and partially ejected the teen; his head and neck were trapped between vehicle and the ditch. He died as a result of his injuries.
The family brought a wrongful death action against the Department of Transportation and Development (DOTD), arguing that the road was maintained in a hazardous condition. They contended that headwall of the concrete culvert was slightly above grade by about three inches and that the slope of the ditch was steeper than it should be. Obviously, both of these claims involve a lot of technical information about highways and regulations that the average person would not know. Therefore, when this case got to trial, both sides called in experts to determine whether these conditions were violating any rules and whether the above grade culvert and the slope of the ditch could have contributed to the accident regardless of whether they were maintained improperly.