Discharge of informer in certain cases

On the commission of any offence against this Act the offender who, before any information is laid or complaint made against him in respect of such offence, first discovers and informs against any other offender, shall on the conviction of the person against whom the information is given, be discharged and acquitted from all penalties or disqualifications under this Act to which, at the time of giving the information, he may be liable by reason of the offence committed by him and the evidence of such informing party shall on trial at law touching such offence be admitted to prove the facts thereof or relating thereto.