I am wondering if you are a veteran of the armed forces, if so then contact the VA for the benefits for vocational training. If not, then contact your local workforce center for leads.
Many financial grants and loans are available through the financial aid office of the school you want to attend.
Here, in Minnesota, we have a two-year and a four-year criminal justice program that serves law enforcement and other departments. There are scholarships available to law enforcement students who have family members already involved in law enforcement, so check those out at the Web sites that promote the fraternity of police officers. Some of these ideas should help you out.
Another way to find money is to contact your local law enforcement and ask questions about applying for the police department.
One question sticks in my mind is the basic requirements for a law enforcement officer, so check that out before getting started.
Brighan