Section 162 as amended by the aforesaid Act reads: " (1) No statement made by any person to a police officer in the course of an investigation under this Chapter shall, if reduced into writing, be signed by the person making it; nor shall any such statement or any record thereof, whether in a police diary or otherwise, or any part of such statement or record, be used for any purpose (save as hereinafter provided) at any inquiry or trial in respect of any offence under investigation at the time when such statement was made: Provided that, when any witness is called for the prosecution in such inquiry or trial whose statement has been reduced into writing as aforesaid, the Court shall, on the request of the accused, refer to such writing and direct that the accused be furnished with a copy thereof, in order that any part of such statement if duly proved, may be used to contradict such witness in the manner provided by section 145 of the .