Challenging Blood Test Results in Massachusetts OUI Cases
Blood test evidence in DUI cases is not infallible. Learn about constitutional protections, scientific challenges, and defense strategies.
If you’re charged with OUI/DUI in Massachusetts following an accident or medical emergency requiring hospital care, police might request a blood test under the implied consent law. This law, outlined in G.L. c. 90, § 24(1)(f)(1), mandates drivers submit to chemical tests to determine blood alcohol content (BAC) when arrested for suspected impairment.
When Police Request Blood Tests
In certain accident cases, police may issue a citation rather than make an arrest. Without an arrest, implied consent laws don’t authorize police to demand a blood sample. Hospitals, however, may conduct blood tests for medical reasons, including ethanol screenings.
Accidents often prompt police to seek an immediate threat license suspension from the Registry of Motor Vehicles (RMV). This is due to the longer processing times for blood tests compared to breathalyzer results. Such suspensions remain until the individual proves they’re not a public safety threat.
Constitutional Protections: The Fourth Amendment
The U.S. Supreme Court affirms that individuals have a reasonable expectation of privacy in their blood. This means you have the constitutional right to refuse a government-requested blood test. Drawing blood is considered a search under the Fourth Amendment, as established in landmark cases:
Key Supreme Court Cases
- Schmerber v. California — Established that blood draws constitute a search requiring constitutional protections.
- Missouri v. McNeely — Ruled that the natural dissipation of alcohol in blood does not automatically create an exigent circumstance justifying a warrantless blood draw.
Exceptions to the Warrant Requirement
For police to obtain a blood sample without a warrant, exceptions must apply:
- Voluntary consent — must be given freely; the burden is on the state to prove voluntariness.
- Emergency circumstances — rare, narrowly defined situations.
Commonwealth v. Dennis
The court emphasized that police must clearly specify when requesting a blood test, not just refer to a generic “chemical test.” This distinction is critical for defendants’ informed consent.
Warrants and Medical Blood Samples
Sometimes police secure warrants to access hospital-drawn blood samples. If a hospital collects more blood than necessary for medical care at law enforcement’s request, this could violate Fourth Amendment rights. Defense attorneys often scrutinize these scenarios to potentially exclude such evidence.
Admissibility of Blood Test Evidence
For blood test results to be admissible in court:
- Tests must be conducted as directed by police with the subject’s consent
- Results should be accessible to the defendant
- Defendants must have the option for independent testing
- Only qualified medical personnel can draw blood for legal purposes
- State crime lab tests (gas chromatography) must comply with specific regulations
Hospital Blood Tests & Legal Implications
When hospitals perform blood tests for medical treatment, Fourth Amendment protections differ since law enforcement isn’t directly involved. Prosecutors can request these medical records under strict legal standards.
Enzymatic Testing Concerns
Hospitals commonly use enzymatic tests, which are quick but not designed for precise BAC measurement. These tests often:
- Overestimate alcohol levels
- Lack the forensic rigor required for criminal cases
- Have calibration, sterilization, and chain-of-custody issues
Medical Records as Evidence
While hospital records can be admitted under G.L. c. 233, § 79, their reliability can be contested. The Massachusetts Supreme Judicial Court ruled in Commonwealth v. Wall that unconfirmed screening results lack the necessary reliability for legal proceedings.
Key Takeaways for Blood Test Defense
- Blood draws are a search under the Fourth Amendment, requiring a warrant or valid exception.
- Consent must be voluntary — coerced or unclear consent can be challenged.
- Hospital enzymatic tests are unreliable for forensic BAC measurement.
- Chain of custody and lab procedures must be meticulously documented.
- Medical records can be contested if based on unconfirmed screening results.
Attorney Adela Aprodu’s expertise in challenging blood test evidence ensures that defendants receive robust legal protections and a fair trial. She will aggressively scrutinize every aspect of the blood testing process to defend your rights.
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