Expert

From Conservapedia

An expert is someone who is considered to possess knowledge and/or technique in a specialist field of study or activity above that of the average person. Those with great skills and knowledge may be called upon to give testimony in a court of law to enable a judge and/or jury to determine the veracity of items of evidence.

The U.S. Supreme Court began to limit the use of expert testimony in trials in [Daubert v. Merrell Dow Pharmaceuticals, Inc.]]. Subsequent decisions have placed additional limits on the use of experts in trials, but they still exert enormous influence on juries.

An expert system is a computer program that uses decision-trees evaluate responses from an individual and give diagnosis or propose a plan of action