Many information we get from book but these types of information we can get only in this CID serial . Criminal Investigation Department( CID) is the serial in which they shows the crime investigation manner and to investigate the crime case as a detective . you can also solve these types of small problems so friends keep watching these serials it is benificial for us only. This cId Serial is very awsum serial it give us techniques and detective information and how to caught the criminal with one single evidence . CID serial is best serial . Very very nice.