'In other northern states, 90 percent prisoners get parole, whereas here only 5 to 10 percent are let off on parole -- that too for very little time,' the letter added.

The letter has triggered a follow-up report from Delhi Legal Services Authority (DLSA), who said it reflects a practical state of affairs of prisoners in the capital.

As per the laws, a prisoner gets parole for various reasons -- to visit a dying or sick family member, build a house, or repair a badly damaged home, among others.

The official process on an application for parole starts with its verification by the local police and has to be finally cleared by the lieutenant-governor.