Section 45 of BSA : Section 45: Grounds of opinion, when relevant.

Explanation using Example

Example 1:

Dr. Mehta, a forensic expert, is called to testify in a murder trial. He provides his opinion that the bloodstains found on the accused's clothing match the blood type of the victim. To support his opinion, Dr. Mehta explains the scientific experiments and DNA tests he conducted in the laboratory, detailing the procedures and results that led him to this conclusion. The court considers both his opinion and the grounds on which it is based as relevant evidence.

Example 2:

In a property dispute case, Mr. Sharma, a handwriting expert, is asked to determine whether a signature on a disputed will is genuine. Mr. Sharma testifies that, in his expert opinion, the signature is a forgery. He supports his opinion by presenting a detailed analysis of the handwriting characteristics, comparing the disputed signature with known samples of the deceased's handwriting, and explaining the specific features that led him to conclude that the signature was not authentic. The court takes into account both his opinion and the detailed analysis he provided.