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Problems with Gas Chromatography in Oklahoma

Problems with Gas Chromatography in Oklahoma

The state of Oklahoma uses gas chromatography to test blood samples for blood alcohol concentration in DUI cases. This article summarizes the chromatography process and some common problems with it that can be raised in court. What Is Gas Chromatography? Gas chromatography (GC) is a scientific test used to separate and analyze chemical compounds, such as alcohol molecules and blood. The test involves injecting a known volume of the driver’s blood into a narrow tube, called a column. The blood sample is swept through the tube by a stream of carrier gas, such as helium. The tube contains a device called a...

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Problems with Identification Testimony in Oklahoma

Problems with Identification Testimony in Oklahoma

There are many ways to challenge identification testimony in court, because eyewitness statements are inherently unreliable tools to establish people’s identities. Numerous studies show that witnesses misidentify people in lineups and in the courtroom for many different reasons. In recent years, challenges to convictions based on mistaken eyewitnesses have resulted in many innocent people freed. Some common problems with eyewitness testimony: Witnesses are distracted by weapons, moving vehicles, or clothing (like a hat pulled down low) Poor lighting at the scene, or poor vision on the part of the witness Stress and anxiety during the crime and afterward Witness bias or...

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