Prang One:
If an on the spot breath test reveals positive, another is taken and if that is positive then blood samples are taken for further examination. 5ml of blood are taken and divided into two, one for the Forensic Science laboratory and the other for private analysis, if the subject wishes.
Gas chromatography is used to find the quantity of Ethanol present. (I won't go into the proceedure). In a modern lab the sample is run on two separate machines operated by two separate officers to obtain total coroboration.
Once again all this post is for general info on proceedures and has little to do with the original thread...The chap was cleared ....close it.
