in which cases Police has power to investigate the without warrant ?

By an amendment to Section 174 of the Criminal Procedure Code a police officer has been given the authority to investigate the following cases without warrant:

– sucide by a woman within seven years of her marriage;

– death of a woman within seven years of her marriage, if there is a reasonable suspicion that some one has committed an offence on her before her death’

– death of a woman within seven years of her marriage, when any of her relatives make a request to the police officer to investigate the matter;

– in case of any doubt regarding the cause of death.