My brother is already in jail. The police took my father for questioning and haven’t released him yet. How long can they keep someone in police custody for investigation? What laws are they violating?

The police can detain your father for up to 24 hours without a warrant under Section 41 of the Code of Criminal Procedure. However, if they need to keep him longer, they must produce him before a magistrate within 24 hours and seek an extension. If they exceed this timeframe without a valid reason or judicial authorization, they are violating your father’s right to liberty enshrined in the Indian Constitution.