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I am sorry to hear this. The only surefire way would be to have them sign a release or waiver of liability. However, I know that is very unlikely. I think since the sheriff already knew and did not do anything, they are not likely to do anything days later. This falls in the realm of civil liability so your insurance should cover your expenses or even your company taht you work for should cover your defense costs.
I would not suggest talking to the officer on your own. If you can afford a criminal defense attorney to talk to them so that you have some comfort, then you should do that. I think your company's insurance should cover or your professional liability policy would kick in if they were to file a lawsuit. I think they are more likely to do that then get you arrested for this.