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Two states, Madhya Pradesh and Uttar Pradesh, accounted for most of the detentions under the National Security Act in 2017 and 2018. 66% or two-third of NSA detentions were in MP and 28% in UP. For these two states, these are worrying statistics. NSA allows preventive detention without trial for up to two years and several cases of misuse of this law have cropped up in these two states.

The most high profile case in recent times was Kafeel Khans detention for over six months just after he secured bail in a criminal case lodged against him. Similar instances of using NSA to keep people behind bars have also been reported in cow slaughter cases to prevent the accused from stepping out of prison after securing bail. Recently UP has mulled using NSA even in rape and murder cases.

Preventive detention laws like NSA are laws of last resort to detain those whom the state suspects are on the verge of breaching law and order. However, concerns about preventive detention militating against civil liberties makes it a grey area. This demands that states use this law sparingly. It is a good sign that most states in India havent followed the MP and UP example. Delhi, for instance, hasnt detained anyone under NSA even once in the past five years. UP and MP must review the tendency to invoke NSA frequently.

More here:
What makes MP and UP invoke the National Security Act so often? - The Times of India Blog