Section 45 of the Indian Evidence Act, 1872 states that any opinion of the person specially skilled in science, art, foreign law, identity of handwriting and finger-impressions is relevant. Hence, when the court seeks any opinion from the expert who acquires some special kind of knowledge or skill, such opinions are admissible in the court.
Keshav Lal v. State of Madhya Pradesh (AIR 2002 SC 1221)
L.C. Goyal v. Smt. Suresh Joshi (AIR 1999 SC 2222)