Personal Liberty- Merely Because An Arrest Can Be Made Lawfully, It Does Not Mandate That Arrest Must Be Made : Supreme Court https://www.livelaw.in/top-stories/supreme-court-personal-liberty-arrest-need-not-be-made-because-lawful-179873  

the trial court, in this case has taken a view that unless the person is taken into custody the chargesheet will not be taken on record in view of Section 170 of the Code of Criminal Procedure. On this aspect, it held that Section 170 of the Cr.P.C. does not impose an obligation on the Officer-in-charge to arrest each and every accused at the time of filing of the charge sheet.

Personal liberty is an important aspect of our constitutional mandate. The occasion to arrest an accused during investigation arises when custodial investigation becomes necessary or it is a heinous crime or where there is a possibility of influencing the witnesses or accused may abscond. Merely because an arrest can be made because it is lawful does not mandate that arrest must be made.',

 

Observations in Joginder Kumar case:  

"No arrest can be made because it is lawful for the police officer to do so. The existence of the power to arrest is one thing. The justification for the exercise of it is quite another. The police officer must be able to justify the arrest apart from his power to do so. Arrest and detention in police lock-up of a person can cause incalculable harm to the reputation and self-esteem of a person. No arrest can be made in a routine manner on a mere allegation of commission of an offence made against a person. It would be prudent for a police officer in the interest of protection of the constitutional rights of a citizen and perhaps in his own interest that no arrest should be made without a reasonable satisfaction reached after some investigation as to the genuineness and bona fides of a complaint and a reasonable belief both as to the person's complicity and even so as to the need to effect arrest. Denying a person of his liberty is a serious matter. The recommendations of the Police Commission merely reflect the constitutional concomitants of the fundamental right to personal liberty and freedom. A person is not liable to arrest merely on the suspicion of complicity in an offence. There must be some reasonable justification in the opinion of the officer effecting the arrest that such arrest is necessary and justified. Except in heinous offences, an arrest must be avoided if a police officer issues notice to person to attend the Station House and not to leave the Station without permission would do".

guildelines: 

1.An arrested person being held in custody is entitled, if he so requests to have one friend, relative or other person who is known to him or likely to take an interest in his welfare told as far as is practicable that he has been arrested and where he is being detained.
2.The police officer shall inform the arrested person when he is brought to the police station of this right.

3. An entry shall be required to be made in the diary as to who was informed of the arrest. These protections from power must be held to flow from Articles 21 and 22(1) and enforced strictly. It shall be the duty of the Magistrate, before whom the arrested person is produced, to satisfy himself that these requirements have been complied with.

The above requirements shall be followed in all cases of arrest till legal provisions are made in this behalf. These requirements shall be in addition to the rights of the arrested persons found in the various police manuals. These requirements are not exhaustive. The Directors General of Police of all the States in India shall issue necessary instructions requiring due observance of these requirements. In addition, departmental instruction shall also be issued that a police officer making an arrest should also record in the case diary, the reasons for making the arrest.

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