Ramanlal Rathi v. the State AIR 1951 Cal 305

If at the end of a criminal prosecution the evidence leaves the Court in doubt as to the guilt of the accused the latter is entitled to a verdict of not guilty. A retrial may be ordered when the original trial has not been satisfactory for particular reasons, for example if evidence had been wrongly rejected which should have been admitted or admitted when it should have been rejected, or the Court had refused to hear certain witness who should have been heard. But retrial cannot be ordered on the ground that the prosecution did not produce the proper evidence and did not know how to prove their case