law: 137. Execution of sentence of imprisonment in special cases.-
  Whenever, in the opinion of an officer not below the rank of Additional Deputy Inspector-General within whose command the trial is held, any sentence or portion of a sentence of imprisonment cannot for special reasons conveniently be carried out in Force custody in accordance with the provisions of section 135, such officer may direct that such sentence or portion of sentence shall be carried out by confinement in any civil prison or other fit place.