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Shepherd and Hayes Law Firm, PLLC

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Shepherd and Hayes Law Firm, PLLC

Free Consultation (603) 233-1626


Compared to other tests and devices, blood alcohol testing is the most accurate procedure in measuring the amount of alcohol in a person’s body. Ordinarily, the blood alcohol level (BAC) reaches its peak approximately an hour after consumption, but the test could still yield accurate results up to 70 minutes after an individual stopped drinking.

Under New Hampshire DWI laws, a law enforcement officer can request that an individual submit to a blood test if symptoms indicate intoxication while operating a vehicle. Standards specified in NH DWI laws need to be met when conducting such a test.

First, NH drunk-driving rules require tests to be administered either by a licensed physician or certified medical staff. The blood samples will then be analyzed in a state-approved forensic science laboratory or any facility licensed by the U.S. Department of Health and Human Services.

Blood test results may be considered by the court as admissible evidence provided the test was conducted in the manner prescribed by the applicable New Hampshire DWI regulations.

DWI Defense Related To Blood Alcohol Testing

The blood-testing procedure called gas chromatography yields the most accurate among all types of blood tests. However, in spite of its reliability, drawing blood from an individual is still considered an invasive and very costly procedure.

For this reason, New Hampshire still allows the measurement of alcohol through a breathalyzer, which is definitely cheaper than conducting a blood test.

Even if a blood test is considered to be more accurate than a breath test, it still has flaws that could affect the outcome of a DWI court procedure. If there is enough evidence to prove an error on the side of the state, it could cast a doubt on the results which will help the defendant in the court proceedings.

First, there were NH drunk driving cases where law enforcement officers have used an expired kit. There were also cases where the person administering the test (phlebotomist) failed to use an anti-coagulant, a chemical used to prevent fermentation of the blood sample, which could lead to a higher BAC level reading. Storing the blood sample at an inappropriate temperature could also lead to fermentation.

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