17. The Government may, if it thinks fit, on the request of a person surrendered to Bangladesh in pursuance of a requisition under section 15, arrange for him to be sent back at the cost of the Government and with as little delay as possible to that State by which he was so surrendered if,-(a) proceedings against him for the offence for which he was surrendered are not begun within the period of six months from the day of his arrival in Bangladesh; or(b) he is acquitted or discharged on his trial for that offence.