Which section of the CrPC deals with police investigations without the permission of a magistrate?

Which section of the CrPC deals with police investigations without the permission of a magistrate?

سی آر پی سی کا کون سا سیکشن مجسٹریٹ کی اجازت کے بغیر پولیس تفتیش سے نمٹتا ہے؟
Explanation

 Section 155 pertains to non-cognizable offenses, where police require magistrate's permission to investigate