Section 149 of CRPC "Police to prevent cognizable
offences"
Every police officer may interpose for the purpose of
preventing, and shall, to the best of his ability, prevent, the
commission of any cognizable offence.
Section 150 of CRPC "Information of design to commit
cognizable offences"
Every police officer receiving information of a design to
commit any cognizable offence shall communicate such information
to the police officer to whom he is subordinate, and to any
other officer whose duty it is to prevent or take cognizance of
the commission of any such offence.
Section 151 of CRPC "Arrest to prevent the commission of
cognizable offences"
(1) A police officer knowing of a design to commit any
cognizable offence may arrest, without orders from a Magistrate
and without a warrant, the person so designing, if it appears to
such officer that the commission of the offence cannot be
otherwise prevented.
(2) No person arrested under sub-section (1) shall be detained
in custody for a period exceeding twenty-four hours from the
time of his arrest unless his further detention is required or
authorised under any other provisions of this Code or of any
other law for the time being in force.
Section 162 of Code of Criminal Procedure Is statement to Police to be signed. Statements of Police not to be signed