^^ they take the lowest of 2 readings so she would be over the limit.
I got stopped for DD 13 years ago and I blew 36 twice, that was a blood sample case.The officer said I was the least over the limit he had ever had to charge. Still got £150 fine and a years ban. I thought i had got away with it when they said they had to call a doctor to take the blood sample, I was expecting it to take 1/2 an hour or so and I'd be under the limit by the time he arrived, but he was there in 3 mins flat , I think he must have been waiting in the next room.