New Delhi, Aug. 21 -- Transfer of investigation to the CBI cannot be a routine exercise and should be done only in exceptional circumstances, the Supreme Court said on Wednesday.

A bench of Justice Hrishikesh Roy said one factor which is considered relevant for induction of the central agency like the CBI in an investigation is to retain public confidence in the impartial working of the State agencies .

The court referred to its recent decision in a case related to journalist Arnab Goswami and said it not for the accused to choose the investigating agency.

The apex court made these observations while upholding the Bihar government's recommendation to transfer the FIR lodged in Bollywood actor Sushant Singh Rajput's death case in Patna to...