Case Name : Mukesh Singh vs State (Narcotic Branch of Delhi) Case Reference: (2020) 9 SCR 245 :
Neutral Citation: Case Number: SLP (Crl) Diary No 39528/2018 Court: Supreme Court Bench: 05 Coram: Arun Mishra, Indira Banerjee, Vineet Saran, MR Shah, Ravindra Bhat Date: 31.08.2020

General proposition of law is that in each and every case where the informant is the investigator there is a bias caused to the accused and the entire prosecution case is to be disbelieved and the accused is entitled to acquittal;
Where the informant himself is the investigator, that itself will not vitiate the investigation from the vice of unfairness or bias.

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PDF: Mukesh Singh vs State, (2020) 9 SCR 245.pdf