“The story did not begin in 2015. It did not even begin with the Juvenile Justice Act of 2000. Nor did it begin with the Juvenile Justice Act of 1986.”
Correct. India did pass major child justice laws in 1986, 2000, and 2015 in that exact order.
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India's statutory regime for juvenile justice evolved sequentially across these exact Acts. Parliament passed the Juvenile Justice Act, 1986 (Act 53 of 1986) to create a uniform national law, which was repealed and replaced by the Juvenile Justice (Care and Protection of Children) Act, 2000 (Act 56 of 2000) following India's ratification of the UN Convention on the Rights of the Child. That law was subsequently replaced by the Juvenile Justice (Care and Protection of Children) Act, 2015 (Act 2 of 2016).
Where this comes from: Acts of the Parliament of India (Legislative Department, Ministry of Law and Justice).