Indian Evidence Act, 1872
29. Confession otherwise relevant not to become irrelevant
because of promise of secrecy, etc.
If such a confession
is otherwise relevant, it does not become irrelevant merely because it was made
under a promise of secrecy, or in consequence of a deception practiced on the
accused person for the purpose of obtaining, it, or when he was drunk, or
because it was made in answer to questions which he need not have answered,
whatever may have been the form of those questions, or because he was not
warned that he was not bound to make such confession, and that evidence of it
might be given against him.