A preliminary examination is a step in the criminal process in which the district court determines whether a defendant may be charged with a felony. A felony is a crime for which the potential punishment is over one year in prison, as opposed to a misdemeanor, which carries a maximum sentence of up to one year in jail.
The preliminary examination, generally referred to as a prelim, involves a hearing in which the district court will determine two things. First, whether there is probable cause to believe that a felony has been committed, and second, whether there is probable cause to believe that the defendant committed that crime. Probable cause means that it is more likely than not that a felony occurred and that the defendant committed that felony. Probable cause is a much lower standard of proof than is proof beyond a reasonable doubt, the standard needed for a criminal conviction.
In most courts a pre-examination conference will be held. Much like at a pre-trial conference for misdemeanors, the prosecutor and defense counsel will see if the case can be resolved through a plea bargain. If no resolution can be negotiated, then the case will proceed to the preliminary examination.