Judges require federal court judges to ACT AS JUDICIAL "GATEKEEPERS" BY BARRING EXPERT TESTIMONY UNLESS IT IS BOTH RELEVANT AND RELIABLE. This was argued when they have prohibited the admissibility of expert testimony regarding the accuracy of eyewitness testimony.
More about expert testimony:
Understanding the distinctive role that experts and their testimony play in the legal system is essential before analyzing the specifics of court rulings regarding expert admissibility.
Experts can provide explanations for events that they have not personally witnessed. Ordinary witnesses, on the other hand, are typically limited to incidents they have personally witnessed.
Furthermore, experts are permitted and called upon to provide opinions to courts about a wide range of topics based on their expertise, experience, or research, but regular witnesses are only authorized to provide factual testimony.
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