The officer allegedly involved - Trooper Larry Lovick - resigned from the patrol in June amidst an investigation into sexual misconduct allegations.
He has not been charged. ABC11 reported in November that the State Bureau of Investigation has finished its probe of the matter and turned its findings over to Wake County District Attorney Colon Willoughby. He is conducting his own investigation and has not said when he will make a decision on the case.
According to documents obtained by ABC11, the incident took place during a traffic stop on May 24.
The woman's family says the woman claims Lovick made her get into his car, handcuffed her, and exposed himself to her.
"He went around a dark industrial building where there were no cars in a parking lot and told her to get out of her car and get into his car," said the family member who asked not to be identified. "He handcuffed her and exposed himself to her and attempted to molest her."
She said she hesitated reporting the incident in fear of taking on the Highway Patrol.
ABC11 has confirmed Lovick was working the night shift that night in an unmarked car. ABC11 has also learned Lovick was suspended without pay for three days just months before the May incident was reported.
The Highway Patrol will not release any details about the suspension or the resignation - since they're personnel matters and are part of an ongoing investigation.
"I think personnel records in a case like this should be a matter of record," said the family member. "Especially since he's resigned and resigned as a result evidently of this event."
The family says it's concerned there may be other alleged victims.
"I would just hope that some of the others are going to have the courage that this young lady has and come out in say this happened to me also," said the family member.
Anyone who has any information that may be helpful to the case should contact the Wake County District Attorney's Office.