When a person gives a complaint to police under Sec 154, he is INFORMANT. Do not use word "complainant" to describe him.
When a person walks in a court of Magistrate and gives complaint under Sec. 200, he is COMPLAINANT. Do not use word "Informant" to describe him.
SC judgement dated 19/11/13 in Criminal Appeal No. 1948 of 2013
2013 (14) Scale 59 para 12
Haresh Raichura
29/13/2013