SC: Life imprisonment means whole life, not 14 or 20 years


In case of certain life convicts, in judgement reported in JT 2013(3)SC 20, it has been clarified that life imprisoonment means whole life. It does not mean that a convict has to be released after 20 years. This power to release early are wholly in hands of State.
The further questions arises are how these powers are to be exercised by State? Does it have arbitrary powers to grant powers?