Plea bargaining in the United States
The constitutionality of plea bargaining was established by "Brady v. United States" in 1970, although the Supreme Court warned that plea incentives which were sufficiently large or coercive as to over-rule defendants' abilities to act freely, or used in a manner giving rise to a significant number of innocent people pleading guilty, might be prohibited or lead to concerns over constitutionality. "Santobello v. New York" added that when plea bargains are broken, legal remedies exist.
Traffic ticket
Although each judge, state, county or municipality handle contested hearings a little differently, the court may make provisions for the prosecutor to achieve a deal with the motorist, often in the form of a plea bargain that may reduce the impact from that which would be incurred from pleading guilty without attending court. If no agreement is reached, and the prosecutor feels it is worth his time to charge the motorist, both motorist and officer, or their respective representatives, formally attempt to prove their case before the judge, who then decides the matter.