You first need to be able to write proper English.
Secondly, the US should not be treated as an open "job fair" where people from other countries come to find employment in law enforcement, while there are several legal US residents trying to find jobs. Sometimes there are 750-1000 applicants applying for one CSI position.
A big question for you is how can you qualify to work in the United States. You can do a little research on the internet (google: working in the usa as a Indian citizen) but as I understand it you need to do one of these:
OR find an employer who will sponsor you for a temporary worker visa for a job opening they have. Since there are a lot of USA citizens applying for the CSI jobs, it might be difficult for you to get an agency to go to the trouble of sponsoring you unless you have a lot of experience or a speciality they really want.
eashwar raghunathan wrote
... please let me know how can i join the department and work. ...