Criminal law is the essential subject being taught in LLB course. In order to specialise in the criminal law and other law related fields, you have to persue this course - the duration of which is three years. During the learning session, you would come across several rounds of mock - tests where you would learn many useful tips to handle the criminal cases.
After acquiring this degree, you have to pass the Bar examination so that you can independently practice as a criminal - lawyer.
Forensic - science is a specialised branch where broken hairs, stain of blood lying on the floors or any broken materials found in the vicinity where murder has taken place are the essential tools for the further investigation. Here the hairs are subjected to place in a high ordeed resolution power of a modern microscope to match the charecterestic of the hair and such investigation helps in tracking the real culprits.
So this science is entirely a new branch giving entire clues of the dubious people and if you have inclination for this science, you can take up the same by taking up the certification - course.