ASG: FIR is 'mandatory' if cognizable offense made out. Averments by informant have to be seen. Ordinarily, I have to go to local area where incident has occurred. But this case is different. Here, CM is an accused. She's the person who has committed theft. In presence of Police Commissioner, DGP. Head of police accomplice. No FIR registered in state regarding this could be investigated [fairly]. CBI investigation has to be ordered.