When the opinion of any person is relevant except experts under the Indian Evidence Act, 1872?

The Indian Evidence Act, 1872 provides that, in addition to the opinions of experts, opinion of any other person is also relevant in the following cases: Opinion as to the handwriting of a person if the person giving the opinion is acquainted with the handwriting of the person in question. (Section 47) Opinion as to the digital signature of any person, the opinion of the Certifying Authority which has issued the Electronic Signature Certificate. (Section 47A) Opinion as to the existence of any general right or custom if the person giving the opinion is likely to be aware of the existence of such right or custom. (Section 48) Opinion as to usages etc. words and terms used in particular districts, if the person has special means of knowledge on the subject. (Section 49) Opinion expressed by conduct as the existence of any relationship by persons having special means of knowledge on the subject. (Section 50)