CrPC 4- Jurisdiction / Cognizance

The Hon'ble Supreme Court of India in one of the following cases held that the general principles of criminal juridiction is that jurisdiction is determined by the locality or any other similar attributes of the offender-

Supreme Court in which case observed that even if the crime is committed in one State it can be tried in another State if the detrimental effect is in that State . The principle of 'Crime is Local' is not applicable in such case ?

"Provisions of Section 195 of the Code are mandatory and non-compliance of it would invitiate the prosecution and all other consequential orders." In which case court upheld so

The words 'may take cognizance ' in Section 190(1) cannot be equated with 'must take cognizance'. The Magistrate on recieving complaint is not bound to take cognizance of offence. In which case Supreme Court observed this ?

In which case Supreme Court held that court can take cognizance only once . Once the cognizance is taken the court becomes functus officio ?