Say the ratio out loud before you open Reasoning — recalling it unprompted is exactly what the exam pays for.
Why it matters
Arrest questions are usually argued at the wrong level. The student says that arrest deprives a person of liberty and must therefore be justified; the examiner wants to know what arrest is for, because the purpose is what makes the difference between a lawful arrest and a punitive one, and it is what the court is weighing when it decides whether custody is needed at all.
Adri Dharan Das supplies that statement of purpose, and it is the sentence to quote at the head of an answer on arrest, on remand, or on anticipatory bail.
Facts
The proposition below was stated by the Court in the course of considering the relationship between arrest and the investigation of an offence. The decision as the course carries it establishes the proposition rather than a set of facts, and nothing further about the facts is settled for this paper.
Held
The Court expressed the opinion that "arrest is a part of the process of investigation intended to secure several purposes", and that the accused may have to be questioned in detail regarding various facets of motive, preparation, commission and aftermath of the crime, and the connection of other persons, if any, in the crime.
Reasoning
The reasoning is a characterisation, and it does two things at once. By locating arrest inside the process of investigation, it explains why the power belongs to the police and why it arises at the stage it does. By tying it to interrogation on identified subjects — motive, preparation, commission, aftermath, and the involvement of others — it supplies a test for whether custody is actually required in the case at hand: if none of those purposes needs custody to be served, the justification for arrest falls away.
That is the step a student can reuse. The question is never simply whether there was a cognizable offence; it is what custody achieves here that the investigation cannot achieve without it.
Exam use
Open with it in any question on the grounds of arrest without warrant, on remand, or on bail, and use it to organise the discussion of the safeguards that follow — the information to be given on arrest, the intimation to a nominated person, the medical examination, and the twenty-four hour limit before production.
It disposes of the view that arrest is an end in itself or a mark of guilt. It does not decide when arrest is necessary in any given case, it lays down no grounds, and it confers no power: the grounds are in the Sanhita, at BNSS ss. 35 to 62 (CrPC ss. 41 to 60), and the arrest provisions were substantially tightened when those sections replaced the 1973 Code.