Section 11 of Evidence Act "When facts not otherwise relevant become relevant"
Facts not otherwise relevant are relevant -
(1) If they are inconsistent with any fact is issue or
relevant fact;
(2) If by themselves or in connection with other facts they
make the existence or non-existence of any fact in issue or
relevant fact highly probable or improbable
Illustration
(a) The question is, whether A committed a crime at
Calcutta on a certain day.
The fact that, on that day, A was at Lahore is relevant.
The fact that, near the time when the crime was committed, A
was at a distance from the place where it was committed.
Which would render it highly improbable, though not
impossible, that he committed it, is relevant.
(b) The question is, whether A committed a crime.
The circumstances are such that the crime must have been
committed either by A,B,C or D. Every fact which shows that
the crime could have been committed by no one else and that
it was not committed by either B, C or D is relevant.