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When a law enforcement officer in North Carolina suspects impaired driving, they may conduct Standarized Field Sobriety Tests IMAGE OF MAN DOING FIELD-SOBRIETY-TESTS (SFSTs) to gauge whether enough evidence exists for an arrest or further chemical testing. Roadside dexterity tests—commonly the Horizontal Gaze Nystagmus (HGN) test, the Walk-and-Turn test, and the One-Leg Stand test—remain a subject of debate. Questions arise about whether these tests are truly “standardized,” whether they reliably they measure impairment or are overly subjective, and how courts treat SFSTs as evidence.

This post explains some of the history of SFSTs, what each test entails, and why a DUI defense lawyer might challenge how an officer administered them. If you have been asked to perform SFST or want legal advice on DWI defenses, call or text the Powers Law Firm at 704-342-4357, or email Bill Powers at Bill@CarolinaAttorneys.com. An informed understanding of roadside tests may help in deciding how to respond during a traffic stop and in developing a defense strategy tailored to the specifics of your individual DUI charges.

Field Sobriety Tests: Table of Contents

North Carolina drivers who are suspected of impaired driving may undergo two main types of breath or alcohol tests: a preliminary IMAGE OF A POLICE OFFICER INVESTIGATING DRUNK DRIVING CHARGES screening at the roadside and an evidentiary test under the state’s implied consent laws. These procedures are guided by statutes like G.S. 20-16.2, which defines the expectations placed on a driver once probable cause is established. Although both tests relate to detecting alcohol, they serve different functions and carry different legal consequences.

This article explains the difference between a quick roadside test (like a PBT) and the more detailed evidentiary procedure (commonly an Intoximeter EC/IR II test), as well as the implications of refusing to cooperate at either stage. If you want to discuss an implied consent issue or need guidance on a DWI charge Mecklenburg, Union or Iredell County NC, please call or TEXT the Powers Law Firm at 704-342-4357, or email Bill Powers at Bill@CarolinaAttorneys.com. A thorough understanding of North Carolina law can clarify how your case might proceed if you encounter allegations of driving while impaired.

Table of Contents: Breath Testing in North Carolina

DUI checkpoints ordinarily involve standardized patterns for stopping vehicles, as well as the use of portable breath tests (PBTs) and SFSTs – Standardized Field Sobriety Tests to assess possible alcohol consumption and appreciable impairment. North Carolina law allows law enforcement agencies to set up checking stations and roadblocks pursuant to N.C.G.S. 20-16.3A to check for things likeDUI-CHECKPOINTS license violations and to enforce the “drunk driving” (impaired driving) laws. The process must follow certain constitutional and statutory guidelines to avoid arbitrary or discriminatory stops.

The following content is a general overview of how roadblocks and checking stations work, including the difference between a brief roadside stop and a more formal implied-consent procedure. If you have questions about a checkpoint stop in North Carolina—or wish to talk about a specific legal concern related to N.CG.S. 20-16.3A—call or text the Powers Law Firm at 704-342-4357, or email Bill Powers at Bill@CarolinaAttorneys.com

North Carolina regulates portable breath tests (PBTs), sometimes referred to as the “breathalyzer,” through specific administrative rules and statutory provisions. Law enforcement officers regularly rely on alcohol screening devices to assess whether a driver has consumed alcohol and may be part of the “arrest decision” related to probable cause. To better ensure reliable readings, the Department of Health and Human Services (DHHS) requires that approved devices be calibrated and verified for accuracy on a regular basis. Deviation from the rules is problematic at best and can, in some PBT-Portable-Breath-Test-BREATHALYZER circumstances, raise doubt about whether a reported BAC reflects the true breath alcohol content.

This article explains how PBTs fit into North Carolina’s regulatory framework and why calibration rules are important. It references 10A NCAC 41B .0503 and related guidelines for monthly checks, breath simulator solutions, and ethanol gas canisters. If you have questions about calibration or how a screening test may apply to your legal matter, give us a call or text the Powers Law Firm at 704-342-4357. You may also email Bill Powers directly at Bill@CarolinaAttorneys.com.

Below is a synopsis of the sections covered in this article. Each entry links to a segment that discusses calibration and how law enforcement officers administer roadside breath tests in North Carolina.

North Carolina regulates alcohol screening under a set of rules involving technical standards, operational procedures, and legal provisions that govern how breath tests are administered and how results may be used in criminal proceedings. Officers rely on portable breath alcohol content screening devices (sometimes referred to as a “PBT” or “breathalyzer”) in the field to detect whether a driver has consumed alcohol. Breath testing devices involve following standards set by the Department of Health and Human Services (DHHS) and must be approved by the Forensic Tests for Alcohol Branch. Breath-Alcohol-Content-Screening-BAC

This post serves as a primer for some of the important aspects of the North Carolina administrative and statutory framework for alcohol screening devices. It explains the significance of regulations like 10A NCAC 41B .0503 and 10A NCAC 41B .0502, along with the NC DWI laws, to show how our state manages breath sampling and the related BAC results. If you have questions about the specifics of your unique legal matter, or if you want to discuss the role of screening devices in your case, give us a ring or text the Powers Law Firm at 704-342-4357.  You may also email Bill Powers directly at Bill@CarolinaAttorneys.com.

Below is a synopsis of the topics covered in this article. Each entry links to a section that describes how North Carolina’s framework addresses the approval and calibration of the PBT and provides a big-picture perspective behind the use of approved alcohol screening devices.


Hemolysis involves the rupture of red blood cells in a blood sample. In the context of criminal charges, this can affect how accurately labs measure blood alcohol concentration (BAC). Mechanical factors like needle gauge selection, centrifugation practices, storage conditions, or simple delays can lead to hemolysis. The result may be an inflated or deflated BAC reading. For someone facing Hemolysis-BAC-Blood-Alcohol-Concentration DUI charges or other criminal matters where BAC plays a role, understanding hemolysis, BAC testing, and its implications can help in reviewing the evidence.


If you have questions about the specifics of your legal matter, the legal team at Powers Law Firm is available for consultation. You may call or text 704-342-4357. You may also email Bill Powers at Bill@CarolinaAttorneys.com.

Below is a brief syllabus of the main topics covered in this document. Each entry links to a corresponding section that explains how hemolysis occurs, how labs test for BAC, and why these details may shape legal strategies.


This article discusses how alcohol normally travels through your body when you’re alive, how that changes once life ends, and why postmortem shifts can influence criminal defense in North Carolina. We will also explore the potential legal implications of anBLOOD-ALCOHOL-CONCENTRATION inaccurate or misleading BAC when the decedent—who, in criminal cases, may be considered a victim—had alcohol in their system.

By clarifying the complexities of forensic toxicology, our goal is to explain why thorough investigation and analysis by forensic toxicologists may be an essential aspect of building a defense strategy.

It is tempting to assume that the number on a lab report reflects an exact level of intoxication at the time of death, but the science behind postmortem BAC is often far more nuanced and complicated. Factors such as redistribution, laboratory processing, and even microbial activity can alter the reading—sometimes making it appear higher or lower than it actually was when the person was alive.

In North Carolina, if someone is killed during the commission or attempted commission of certain felonies involving a deadly weapon, felony-child-abuse-charges-in-north-carolina the offense may be charged as first-degree murder under what is commonly called the “felony murder rule.” Under this doctrine, a homicide arising from the perpetration or attempted perpetration of such a felony is treated as first-degree murder, even in the absence of premeditation or deliberation.

The recent appellate decision State v. Middleton (N.C. Ct. App. 2025) sheds light on how felony murder interacts with allegations of felony child abuse. While the underlying facts involved minors and grave injuries, the published opinion concentrates on the broader legal principles relevant to attorneys, law students, and others interested in North Carolina’s felony murder framework.

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Using social media as evidence in criminal courtrooms in Charlotte and throughout North Carolina has become an everyday reality. Facebook messages, Instagram chats, and other online charlotte-criminal-defense-lawyers communications can strengthen or undercut a case when introduced at trial. Yet questions of authenticity—Is the social media content and the source of those materials identifiable?—and relevance—Does it matter to the issues being tried?—are becoming more and more common during trials.

In North Carolina, these inquiries fall under the North Carolina Rules of Evidence, which guide judges and attorneys in determining which materials the jury is allowed to see. A recent appellate opinion, State v. Davenport, provides an up-close look at how courts tackle social media evidence in serious felony prosecutions.

By examining pictures taken of Facebook Messenger images displayed on a cell phone, the court explored how to authenticate digital content and manage related evidence (like 911 logs) to ensure a fair process. Below, we break down the facts of the case, the legal standards applied, and the broader implications for defendants facing criminal charges and attorneys dealing with social media evidence in the Tar Heel State.

Recent news out of Cornelius, North Carolina, will undoubtedly spark public discourse around defendants’ rights, law enforcement’s role, and the judicial process governing pretrial release. Specifically, an 18-year-old suspect charged with serious child sex offensesCHARLOTTE-CRIMINAL-LAWYERS was released to the custody of his parents pending further legal proceedings.
In response, the Cornelius Police Department issued a strongly worded public statement expressing dismay at the decision to grant release, contending that such an outcome “undermines the gravity of the situation and raises significant concerns about the risk to public safety.”
The Department went on to suggest that individuals facing these types of offenses “should be held in custody, pending further legal proceedings…to send a definitive message that crimes involving the exploitation and violence against children will not be taken lightly.”