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Gas chromatography Tag

Dayton DUI Attorney Charles Rowland > Posts tagged "Gas chromatography"

DUI Science: Gas Chromatography

Gas chromatography mass spectrometry (hereinafter GCMS) is the most reliable method for alcohol testing in blood and urine and has become the accepted gold standard in forensic toxicology.  Gas chromatography specificity for ethanol (drinking alcohol) is very good and this method can also identify and quantify other organic or interfering substances such as methanol and isopropanol. The two commonly used techniques for analyzing the gases are “direct injection” and “headspace analysis.”  The devise works by utilizing a flow-through tube known as the column.  The different chemicals in the sample pass via a gas stream at different rates depending on their interaction with the column’s...

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Ohio DUI Blood Test: How to Win A Blood Test Case

In order to successfully defend a blood test case, a DUI defense lawyer must be familiar with Ohio’s DUI law (O.R.C. 4511.19) and the Ohio Administrative Code sections which apply to the collection, storing, transporting and testing of the whole blood, blood plasma and/or blood serum specimen.  Amphetamine, cocaine, heroine, Marijuana, Methamphetamine, Phencyclidine and L.S.D. are specifically mentioned in Ohio’s DUI/OVI statute as illegal controlled substances. The law states how much of each substance must be detected in a chemical test of urine, whole blood, blood plasma, and/or blood serum in order to sustain a charge.  A blood test is seen as...

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Gas Chromatography Mass Spectrometry (An Overview)

To fully comprehend the processes of chemical testing, your DUI attorney should understand gas chromatography - mass spectrometry. Gas chromatography mass spectrometry (hereinafter GCMS)  is a method that combines the features of gas-liquid chromatography and mass spectrometry to identify different substances within a test sample.  GC-MS has been widely heralded as a "gold standard" for forensic substance identification because it is used to perform a specific test.Ohio Administrative Code 3701-53-03(A) sets forth the techniques and methods for determining the concentration of alcohol in blood, urine and other bodily substances.  Pursuant to that rule, Ohio allows for testing including gas chromatography and enzyme assays.  The GCMS instrument is...

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DUI Blood Tests: Whole Blood vs. Serum/Plasma

Ohio Administrative Code 3701-53-03(A) sets forth the techniques and methods for determining the concentration of alcohol in blood, urine and other bodily substances.  Pursuant to that rule, Ohio allows for testing including gas chromatography and enzyme assays.  To challenge a blood test, it is important to know if the State has tested the blood as whole blood or as serum/plasma.  Operation with a concentration of alcohol is prohibited if the concentration in whole blood is equal to or exceeds .08%, R.C. 4511.19(A)(1)(b).  However, the prohibited concentration for whole blood is a concentration equal to or exceeding .096%, R.C.4511.19(A)(1)(c).  The high...

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DaytonDUI, Defending a Breath Test Case

"I'll Huff and I'll Puff and Blow Your House Down" Did you know that your breathing pattern can significantly alter the concentration of alcohol on your evidential breath test?  According to scientific research, "[t]he subject's test manner of breathing just prior to providing breath for analysis can significantly alter the concentration of alcohol in the resulting exhalation." (Jones, 1982, Schoknecht, 1989) as cited in Physiological Aspecs of Breath-Alcohol Measurement, Alcohol Drugs & Driving Vol. 6, No. 2, A.W. Jones.Hyperventilation "...

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DUI Blood & Urine Testing: Understanding Gas Chromatography

If you have been arrested for a DUI involving blood testing you may encounter a testing procedure known as Gas Chromatography.  Gas Chromatography is the most reliable method for alcohol testing in blood and urine and has become the accepted gold standard in forensic toxicology.  Gas chromatography specificity for ethanol (drinking alcohol) is very good and this method can also identify and quantify other organic or interfering substances such as methanol and isopropanol. The two commonly used techniques for analyzing the gases are "direct injection" and "headspace analysis."  The devise works by utilizing a flow-through tube known as the column. ...

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The Prescription Drug Defense

While many people think of impaired driving as involving alcohol, we are increasingly seeing people accused of being impaired by prescription drugs.  Clients are surprised to learn that the same harsh penalties that apply to alcohol impairment also apply to prescription drug impairment.  You need an attorney who knows how to fight a drugged driving case.Drugged driving cases involving prescription drugs present a problem for law enforcement as indicators of prescription drug use are less apparent.  The standardized field sobriety tests are crude tools for detecting alcohol and may be useless in determining prescription drug impairment.  Challenging the officer's observations...

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Intoxilyzer 8000 Is Unreliable!

Today, in State v. Heather Reid, Case No. TRC 1100716 in the Circleville Municipal Court, Judge Gary Dumm has ruled that "The State of Ohio cannot expect this Court to find the Intoxilyzer 8000 reliable when the State refuses to address known problems and explain why those problems can be ignored."The Court calls for independent laboratory testing to address the issues raised by the adoption of the Intoxilyzer 8000: RFI, sample size of the chamber, volume of the sample tested, possible operator manipulation of the results, possible CMI modifications of the software without the knowledge of ODH and slope detector...

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DUI Case Argued Before U.S. Supreme Court (Bullcoming v. New Mexico)

[caption id="" align="alignright" width="300" caption="Image via Wikipedia"][/caption]Is An Analyst Required To Appear In Court? The United States Supreme Court will hear oral arguments in Bullcoming v. State of New Mexic0 (Docket No. 09-10876) to decide "whether the Confrontation Clause permits the prosecution to introduce testimonial statements of a nontestifying forensic analyst through the in-court testimony of a supervisor or other person who did not perform or observe the laboratory analysis described in the statements."  According the the National College for DUI Defense, Stanford Associate Law professor Jeffrey L. Fisher, who brought and won the Crawford and Melindez-Diaz cases is slated to...

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Blood & Urine Testing in Ohio; O.A.C. 3701-53-03

Image via WikipediaOhio Administrative Code 3701-53-03 regulates the testing of blood, urine and other bodily substances for purposes of evidential testing.  Section (A) is specific to alcohol and approves gas chromatography and enzyme assays as approved testing techniques.  "The technique or method must have documented sensitivity, specificity, accuracy, precision and linearity. The technique or method can be based on procedures which have been published in a peer reviewed or juried scientific journal or thoroughly documented by the laboratory.O.A.C. 3701-53-03(B) sets forth the approved methods for testing blood, urine and bodily...

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