There are plenty of other jobs out there. You'll just have to call the agencies yourself to see what is available. State Agencies . There are plenty of investigative jobs at the state level. There are, of course, state troopers.
Many states have their own state bureaus of investigation and their own investigators.
Also, most states will have their own labs. Again, you'll find the same types of support opportunities here as at the federal level. You'll have to contact your own state agency or check if your state has it's own online bulletin board. The educational requirements will vary between high school diploma and college degree. Big cities have their own police forces, their own investigators and detectives.