Is this a criminal case file? If so, letting a non-commissioned individual (e.g., an explorer) read your case file might violate department policy as well as other records laws. You as a citizen cannot press charges, but you might be able to get a prosecutor or other official to consider pressing charges. You can also consider filing a civil complaint against the Sheriff's Office and if you believe a law has been broken, you can also consider filing a police report (for example, with the Washington State Patrol).
This answer is given merely for informational purposes and does not create an attorney-client relationship. For specific advice, contact an attorney in your state to see if working together makes sense.