An omnibus motion is an application by a defendant asking the court to examine a case from certain legal aspects. The intent is to ascertain whether or not some provisions of state or federal law were violated.
For instance, an accused DUI offender can file a motion to challenge the legality of the traffic stop. According to Avvo, a pretrial omnibus motion may be filed by the defendant to demand discovery of any statements made by the defendant and copies of evidence. The accused may also file the motion when seeking to suppress evidence or dismiss the case in the interest of justice.