The Bharatiya Nagarik Suraksha Sanhita did not abolish the idea that investigation must be fair. A complainant may still ask a magistrate to examine whether the investigation is being conducted, and an accused may still insist that the investigating agency collect what the law requires it to collect.
Applications to add an accused, to preserve electronic devices, or to seek a supervised investigation are not routine. They succeed or fail on the record already in the case diary and on what is demonstrably missing.
The right to remain silent, and the right not to be compelled to self-incriminate, sit in Article 20(3) of the Constitution. They were not repealed by the new codes. An accused who is asked to ‘explain everything’ in writing should take advice on papers before doing so.
This is a map of the terrain, not a pleading.
General information under Indian law. Not an opinion, not a retainer, not a substitute for a conference on your papers.