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Around 12:07 AM on March 1, 2026, Patrolman William Westenberger with the Boonton Township Police Department first responded a report of a motor vehicle crash on Hillcrest Road. He arrived on scene and made contact with the driver of a white 2016 Land Rover Discovery, and she was eventually identified as 18-year-old Olivia Dunn. Her parents had also arrived on scene in a separate vehicle.

The SUV was sideways in the roadway, and there was airbag deployment inside. The vehile had apparently struck another tree, and the driver claimed that she had “slid out of a driveway.” Patrolman Kevin Marhefka arrived shortly afterwards at 12:12 AM and began his DWI investigation. Olivia admitted to consuming alcohol earlier that evening at her friend’s house. Based on his suspicion of impairment, Olivia was asked to perform field sobriety exercises.

The first exercise was the Horizontal Gaze Nystagmus test. During the HGN test, Patrolman Marhefka observed the lack of smooth pursuit, distinct and sustained nystagmus at maximum deviation, and the onset of nystagmus prior to 45 degrees. The second exercise was the Walk and Turn. During the Walk and Turn test, Olivia failed to touch heel-to-toe on each step and turned improperly. The final exercise was the One Leg Stand test. During the One Leg Stand test, Olivia failed to raise her foot in the proper fashion and put her foot down before the test was complete.

Based on the motor vehicle crash, her admission to consuming alcohol, and her inability to satisfactorily complete the field sobriety exercises, Patrolman Marhefka placed Olivia under arrest for driving under the influence. The vehicle she was driving was impounded for a mandatory 12-hour hold under John’s Law. Patrolman Marhefka transported Olivia to the Kinnelon Police Department for the administration of the breath test.

At the Kinnelon Police Department, Olivia was read the Standard Statement for Motor Vehicle Operators, and agreed to submit breath samples. Her Alcotest results indicated a BAC level of 0.208%, which was significantly over New Jersey’s legal limit of 0.01% for drivers under 21 years of age. When the officers were finished with processing her, Olivia was released to her parents pending her court appearance after one of them signed the Potential Liability Warning form on Olivia’s behalf.

Patrolman Marhefka issued Olivia the following traffic citations: 
-Operating under the influence (39:4-50)
-Reckless driving (39:4-96)
-Careless driving (39:4-97)
-Traffic on marked lanes (39:4-88)

As of March 24, 2026, Olivia’s case is still pending before the Boonton Township Municipal Court. 
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