It could.  If you are required to enter a plea or admission of guilt in conjunction with the pre-trial diversion offer, then that admission could be used against you in a possible pending lawsuit.  If you are not required to make an admission or enter a plea, then it will not have as much of an impact.  However, the overall effect would be determined by the nature of the lawsuit that you intend to file. Before you do anything, visit with a civil rights attorney, go over all of the facts of your case... and determine what you actually need to prove to make your case.  If you already have enough evidence to prove your case... then your admission may have little or no impact.