Q: What are the three golden principles of evidence ?

Ans: There are three golden principles of evidence: 

1. Evidence must be confined to matter in issue. It means if the matter is of murder,  the evidence must be presented related to murder and not of theft.

2.  Hearsay evidence will not get admitted. If we talk about the hearsay evidence, it is an evidence which is seen by person A and is told to person B. Thus, B will be the hearsay evidence of an event. 

For instance: If A describes the bomb blast event to B, then the statement of B will be hearsay evidence.