So this is Jetblast.........
BJCC, I'm not an amateur.
You should read the report more carefully.
http://www.trl.co.uk/static/dtlr/pdfs/TRL495.pdf
If you did, you would note that urine is not used to determine blood alcohol (BAC).
Blood is, and only blood.
Urine is only used to confirm the presence of drugs.
BJCC
Technically, I have to retract:
Blood and urine samples were taken, and the urine samples sent for laboratory analysis - but this is just a convenient and rapid method of testing.
The blood samples were retained for confirmation.
The report assumes that a urine sample of 107mg per 100ml is equivalent to a blood alcohol level of 80mg per 100 ml.
However, the coroners form only allows for blood to be tested.