Blood Tests

Drivers arrested on suspicion of DUI / DWI in California must take a breath or blood test to determine the motorist's blood alcohol content (BAC). Although police and prosecutors consider blood tests to be definitive evidence in drunk driving cases, these tests are open to interpretation. A skilled attorney from The Kavinoky Law Firm who focuses on driving under the influence cases has the experience needed to effectively challenge blood test results.

California's Implied Consent Law dictates that anyone who drives in the state agrees to take a chemical test if arrested on suspicion of drinking and driving. If a driver is suspected of driving under the influence of drugs (DUID), a blood or urine test may be required.

If the driver refuses to submit to a chemical test, a number of serious repercussions follow, including fines, mandatory imprisonment if the person is convicted of DUI, and DMV suspension of the person's driver's license. And if the driver refuses a chemical test, the courts have ruled that police have the right to take the defendant's blood by force. Therefore, submitting to the chemical test is in the best interests of someone arrested for DUI.

When a driver opts to take a breath test, the officer must advise the person of the right to take a blood test in order to retain a sample of blood for later testing by an independent forensic toxicologist. Tests are fallible, and human error is not uncommon.

Improper blood-drawing procedures are a common error in blood-testing. When drawing a blood sample for a drunk driving case, the blood should be drawn into a glass tube that contains a white powder in the bottom; the white powder is a mixture of preservative and anticoagulant. If the level of preservative is incorrect, the blood sample can actually ferment and create additional alcohol. If the sample does not contain enough anticoagulant, the blood will clot, reflecting an artificially high blood alcohol level. Independent testing can reveal such instances. Thus, it is to the DUI defendant's best advantage to have his or her blood sample independently tested.

The blood must also be drawn by a person certified to perform the draw. The driver's arm should be cleaned with an alcohol-free wipe. Once drawn, the blood sample must be shaken in order to thoroughly distribute the anti coagulant and preservative. The sample should be stored in a controlled environment in order to preserve the quality of the sample. Therefore, when defending a drunk driving case it's important to identify the "chain of custody" in order to fully understand who had access to the sample, when and how it was stored.

Even when the blood sample is properly collected and stored, the result doesn't necessarily mean the driver is guilty of DUI / DWI. While chemical testing may be accurate to determine blood or breath alcohol content at the time of testing, it is not conclusive evidence of BAC at the time of driving. It is not illegal to be above the legal limit while in a police station. The offense is driving under the influence, not having a BAC above the legal limit at a later time. Because alcohol levels change over time, this is a critical point to understand.

Ultimately, blood tests and other chemical test results can be successfully challenged in drunk driving cases. When it comes to issues of blood-testing in a drinking and driving case, it's important to have a California lawyer who specializes in DUI / DWI defense on your side.