Prosecutor can prohibit civil suit as condition of dropping charges

In Cady v. Arenac County, et al, the Sixth Circuit upheld a prosecutor's management of an assault charge.  When Cady was arrested for battery, the prosecutor agreed to dismiss the criminal action, provided Cady agreed to forego filing a civil claim against the other involved parties for six months.  While on the surface this appears to be a violation of Cady's civil and constitutional rights, the Court of Appeals upheld the prohibition as a reasonable one, given that the ban would last for only six months and appeared to be a reasonable effort to dampen emotions following the civil disturbance.