Laura Robinson and Leigh Creany were killed
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A woman who killed two other women in a car crash while driving the wrong way on a motorway spoke to police minutes before, the BBC has learned.
Mary Mullin, 53, from Beragh in County Tyrone, pleaded guilty to causing death by dangerous driving in the head on collision on the M1 a year ago.
Laura Robinson, 19, and Leigh Creany, 21, were killed in the crash. They worked together in a bank.
Mullin, who had also originally denied driving whilst unift, changed her plea to guilty a week before her trial was due to begin.
The family of Laura Robinson said they were disappointed a trial would now not take place and feel there are still questions to be answered about the girls' deaths.
They said Mullin had been spoken to by traffic branch officers before the crash but was allowed to go on her way.
Louise Robinson said there had been reports of a silver Land Rover swaying across the motorway.
"The lady had pulled in on the hard shoulder and two police officers from the traffic branch had pulled in with her.
"We want to know why it hadn't been found out then that she had been drunk because, obviously, the drink should have been smelled."
She said her family wanted a public inquiry into the circumstances surrounding the collision.
The Police Ombudsman's office confirmed it had received a complaint surrounding the incident and said the allegations were being investigated.
Mullin will be sentenced at a later date.