A red car was involved in a crash at 1200hrs on the 20/9/23 in Newcastle upon Tyne

A red car was involved in a crash at 1200hrs on the 20/9/23 in Newcastle upon Tyne.  The driver failed to stop at the scene, but his number plate was taken and reported to the police.   The police traced the owner, Brian Jones and questioned him regarding the offence.  At this time, he smelt of alcohol which he claims was due to him panicking when the accident occurred and having a drink to calm his nerves.

The police arrested him and conveyed him to the police station for a breath examination, however the Camic failed to calibrate.  A forensic medical examiner was asked to attend and a blood sample was obtained at 1428 hours on the 20/9/23. 

His weight was noted as 10st 4lbs (65.3 kg) and his height as 5ft 9in (175cm) and the calculated Widmark factor is 0.76 (according to Forrest)

The blood alcohol concentration was measured and found to be not less than 183mg/100ml

Mr Jones claims he drank 3 x normal measure (assumed to be 25ml, 40%) vodkas and 3 cans (440ml) of Stella Artois ™ (5% v/v) between the time of the accident and the police arriving at his home 

You are asked to perform a back calculation using the method according to Forrest in order to determine whether he was over the legal limit for driving at the time of the accident.  

1. What was the alcohol concentration at the time of the accident? Include all stages of the calculation in your answer.  Note, you can type your calculations out in full, or you can take a photograph of your handwritten calculations providing it is fully legible and insert this into your final document   18 marks

In your opinion what is your conclusion regarding whether or not Mr Jones was under/over the legal limit for driving at this time?

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