CID is a popular tv series and is quite a craze for many teen agers in 90's. To be like the character of Dr. Salunkhe you need to study Forensic Sciences. Now for Forensic science you need to take science in 10+2 with PCM in it. After your 12 you have to take admission in BSc Forensic Science and after that MSc Forensic science. As you do MSc you can apply for the State Forensic Labs (vacancy released by the state government). Now on qualifying the exam and interview you get to be a Forensic Scientist in State Forensic Labs and on promotions you can be part of CBI/CID and if you become specialist in your field due to really good works then you can be even upgraded to RAW/IB. So you need to study forensic science to be a forensic scientist.

To know more about Forensic Science visit the link below:

https://www.careers360.com/courses/forensic-science-course

I hope this answer helps. All the very best for your future endeavors!