Expert evidence,

Definition of Expert evidence:

1. Admissible testimony relating to a professional, scientific, or technical subject. Expert evidence is based on formal and/or special study, training, or experience that imparts the competency to form an opinion upon matters associated with that subject. It is the duty of the authoritative expert to present the necessary scientific/technical criteria to enable a court to test the accuracy of its own conclusions and to form its own independent judgment of the evidence. Before given the permission to state their opinion, the experts are usually questioned by the court to evaluate their qualifications and experience in the subject. Also called expert testimony.`.