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BAC Analysis in a Lab Without Bracketing Controls is at Best Qualitative not Quantitative

April 27, 2018

Purpose:

To obtain an admission that when government scientists conduct a quantitative analysis to determine blood alcohol concentration using blood, urine, or serum, they use positive and negative controls.

To obtain an admission from the government scientist that when they conduct such quantitative analysis they use a low control, an expected midpoint control, and a high control.

To obtain an admission from the government scientist that they would never use just one control at 100 mg/100mls.

To obtain an admission from the government scientist that using just one midpoint control would be unacceptable laboratory practice.

To suggest that use of only one midpoint control in a laboratory does not assist in checking linearity.

To suggest that use of only one midpoint control in a laboratory to obtain a quantitative analysis in a laboratory would not be in compliance with ASCLD/LAB accreditation.

To obtain an admission that if the bracketing controls failed then the result is at best qualitative rather than quantitative.

 

 

 

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If you are a Canadian criminal defence lawyer and you wish to learn more about cross-examination on these issues, we suggest that you visit the Members page at www.impaired-driving.com and enroll in the three online courses that are described therein. Once you have completed the three online courses, you can apply to become a full Member at that site, and if you are accepted for membership, you will have access to the much more extensive Members Only Blog at that site, as well as  additional international resources, links, and materials.

If you are a Canadian criminal defence lawyer and you wish to learn more about cross-examination of Drug Recognition Experts we recommend that you attend an online or recorded session at  https://www.impaired-driving.com/dre-tutorial.

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