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State (Through Cbi/New Delhi) vs S.J.Choudhary on 13 February, 1996
Unknown vs Palakdhari Ilr
State (Through Cbi/New Delhi) vs S.J. Choudhary on 13 February, 1996
State (Through Cbi) vs S.J. Choudhary on 13 February, 1996
Sri Maruthi Processors vs R. Subramaniam on 5 October, 2012

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Central Government Act
Section 45 in The Indian Evidence Act, 1872
45. Opinions of experts.—When the Court has to form an opinion upon a point of foreign law or of science or art, or as to identity of handwriting 35 [or finger impressions], the opinions upon that point of persons specially skilled in such foreign law, science or art, 36 [or in questions as to identity of handwriting] 35 [or finger impressions] are relevant facts. Such persons are called experts. Illustrations
(a) The question is, whether the death of A was caused by poison. The opinions of experts as to the symptoms produced by the poison by which A is supposed to have died are relevant.
(b) The question is, whether A, at the time of doing a certain act, was, by reason of unsoundness of mind, incapable of knowing the nature of the Act, or that he was doing what was either wrong or contrary to law. The opinions of experts upon the question whether the symptoms exhibited by A commonly show unsoundness of mind, and whether such unsoundness of mind usually renders persons incapable of knowing the nature of the acts which they do, or of knowing that what they do is either wrong or contrary to law, are relevant.
(c) The question is, whether a certain document was written by A. Another document is produced which is proved or admitted to have been written by A. The opinions of experts on the question whether the two documents were written by the same person or by different persons, are relevant. Comments Conflict of opinion of Experts When there is a conflict of opinion between the experts, then the Court is competent to form its own opinion with regard to signatures on a document; Kishan Chand v. Sita Ram, AIR 2005 P&H 156. Expert opinion admissibility Requirement of expert evidence about test firing to find out whether double barrel gun is in working condition or not, not necessary; Jarnail Singh v. State of Punjab, AIR 1999 SC 321. The evidence of a doctor conducting post mortem without producing any authority in support of his opinion is insufficient to grant conviction to an accused; Mohd Zahid v. State of Tamil Nadu, 1999 Cr LJ 3699 (SC). Opinion to be received with great caution The opinion of a handwriting expert given in evidence is no less fallible than any other expert opinion adduced in evidence with the result that such evidence has to be received with great caution; Ram Narain v. State of Uttar Pradesh, AIR 1973 SC 2200.