Section 27 of the Indian Evidence Act, 1872 states that-
Provided that, when any fact is deposed to as discovered in consequence of information received from a person accused of any offence, in the custody of a police-officer, so much of such information, whether it amounts to a confession or not, as relates distinctly to the fact thereby discovered, may be proved.
This is based on the “doctrine of confirmation”, for “a fact, if it exists at all, must exist invariably in the same manner whether the confession from which it is derived be in other respects true or false”.