Hello aspirant,

No it is not necessary to do both B.Sc and M.Sc in forensic science in order to get into CBI.

In order to become a forensic scientist candidates must complete class 12 with basic science or maths. Candidates are required to complete their graduation with science/ math/ forensic science/ biotechnology/ pharmacy ( or accordingly to college and recruiters) .

Post graduation isn't necessary but it's always an advantage to have a post graduation degree.