Legal Question in Criminal Law in Minnesota

Re: Pretrial Diversion

This is a civil law question, not a criminal law question, even though related to a criminal case. I have not had a similar case, nor have I researched the published decisions for a similar case. I would be surprised if there were not similar cases in the past, where this question has been decided in various jurisdictions.

If I were to research it, I would be looking for answers to the following questions. Will the statute of limitations bar prosecution of the defendant/would-be plaintiff after three years from the arrest date? Even if he breached the agreement by making a claim against the police office and municipality, etc.? Did the city prosecuting the case commit a crime, by attempting to settle or preclude a civil claim by threat of criminal prosecution? Does the anticipated damage award, whether based upon physical injuries or civil rights violations, amount to enough, in light of the likelihood of survival of defense summary judgment motions based upon immunity claims and likelihood of a plaintiff's verdict -- justify the cost of making a claim against the police officer and municipality, etc.? If not, is it worth the possibility of undoing the settlement of the criminal DWI case, by pursuing such a civil claim? Is this release voidable due its being obtained by improper coercion, against public policy?