Kerry Kennedy's scheduled appearance in North Castle Town Court to learn whether she will face a trial on a charge of driving while drugged has been pushed back until later this month.

It was expected that Town Justice Elyse Lasansky would issue a ruling tomorrow night on a motion for dismissal of the single misdemeanor charge against Kennedy. Westchester County prosecutors have filed court papers opposing the motion.

advertisement | advertise on newsday

The judge has not finalized her ruling and for that reason rescheduled the hearing to 5 p.m. on May 21, a court clerk said.

Kennedy is accused of driving while under the influence of the powerful prescription sleep aid Ambien on the morning of July 13, 2012. The car she was driving sideswiped a tractor trailer as she drove south from her home in Bedford on Interstate 684 before exiting the highway at the Armonk exit onto Route 22.

Another driver called police after he saw her near a traffic light on Route 22, slumped over the steering wheel of her Lexus SUV.

A North Castle police officer and State Police arrested her after she allegedly admitted she might have accidentally taken the sleeping aid instead of her daily prescription medicine for a thyroid condition. State Police blood tests later confirmed she had the sleep drug in her system.