If your criminal charges were dropped, you would need a civil rights lawyer/torts lawyer.
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I suggest you find a civil right lawyer in your area who could help you with this case. I handle this types of cases, so, I can talk to you if you have questions. Call me at (913) 233-2133, or write me at email@example.com. Good luck.
You need a civil rights attorney to bring a suit against the police department.
This answer does not, nor is it intended to, create an attorney-client relationship or constitute attorney advertising. Rather, it is offered solely for informational purposes. The facts of each case are different and unique, it is critical to consult with qualified counsel with whom information can be shared and assessed under attorney-client privilege, so that competent and quality advice can be obtained on which you can make informed decisions