The judgment of the Supreme Court in Arnesh Kumar v. State of Bihar (2014) 8 SCC 273 marked a significant milestone in protecting the fundamental right to personal liberty and preventing unnecessary arrests in criminal cases. The Court observed that arrests were often being made routinely without proper justification, particularly in offences punishable with imprisonment of up to seven years. Emphasising that "arrest is not mandatory merely because it is lawful to do so," the Supreme Court directed police authorities to strictly follow the safeguards contained in the Code of Criminal Procedure, now substantially reflected in the Bharatiya Nagarik Suraksha Sanhita, 2023 (BNSS). The judgment seeks to balance the investigative powers of the police with the constitutional rights guaranteed under Article 21 of the Constitution of India, ensuring that an individual's liberty is not curtailed arbitrarily. The Court held that police officers must record reasons for making an arrest as well as reasons for not making an arrest, depending upon the facts of each case. These directions have become binding on all investigating agencies across India and are frequently relied upon by courts while deciding matters relating to anticipatory bail, regular bail, quashing of criminal proceedings, and illegal detention. The principles laid down in Arnesh Kumar continue to guide police authorities, Magistrates, and courts in ensuring that criminal investigations are conducted fairly while safeguarding the rights of accused persons against arbitrary exercise of police powers.

The Supreme Court specifically directed that in offences punishable with imprisonment extending up to seven years, the police must first examine whether arrest is genuinely necessary under the law. Before taking an accused into custody, the investigating officer is required to consider factors such as preventing further offences, ensuring a proper investigation, preventing tampering with evidence, avoiding inducement or threats to witnesses, and securing the accused's presence before the court. Where these conditions are not satisfied, the police may instead issue a notice of appearance requiring the accused to cooperate with the investigation rather than making an immediate arrest. The Court also imposed corresponding obligations upon Judicial Magistrates by directing them not to authorise detention mechanically. Magistrates must independently examine whether the statutory requirements for arrest have been complied with before approving police custody or judicial custody. Failure by investigating officers or Magistrates to follow these directions may invite departmental action, contempt proceedings, or other legal consequences. These safeguards are particularly relevant in matrimonial disputes, allegations under special statutes where the prescribed punishment falls within the specified limits, financial offences, cheating cases, and other criminal matters where routine arrests were historically common. The judgment has substantially influenced criminal jurisprudence by reinforcing the principle that arrest should remain an exception rather than the rule wherever the law permits such an approach.