CrPC ka Bahana hai ya BNS ki Shakti?

Mujhe lagta hai Section 91 CrPC ka kya masla hai, yeh nahi samjh raha. Kya yeh bolta hai ki Police incharge investigation karegi, ya phir BNS ke under? Iska implication kya hai, bas maine toh abhi se thode hi kaam kiya hai, lekin yeh to confusion banne wala hai. Kya yeh to aisa nahi hai jo IPC mai bhi hoga, maine toh is section se pehle hi kaam kiya hai, lekin yeh section to kuch aur hai.

Section 91 ke under, investigation kisi officer ko sambhali jati hai, lekin phir BNS ke under bhi investigation hui jaati hai.