





August 18, 2026
DUI Defense Resources One drink does not affect every person the same way. A person’s blood alcohol concentration (BAC) can be influenced by numerous factors, including body weight, biological differences, how quickly the alcohol was consumed, whether the person had eaten, the type and strength of the drink, and the amount of time that passed between drinking and driving. Because of these variables, it is not accurate to assume that a single drink will produce the same BAC in every individual.
Table of Contents
Toggle
Pennsylvania law generally prohibits a person from driving with a BAC of 0.08% or higher. Under 75 Pa.C.S. § 3802(a)(2), a driver may be charged when their blood or breath alcohol concentration is at least 0.08% but less than 0.10% within two hours after driving, operating, or being in actual physical control of a vehicle. (Pennsylvania General Assembly)
However, an important point is often overlooked: a BAC below 0.08% does not automatically prevent a DUI charge or arrest in Pennsylvania.
Pennsylvania also recognizes what is commonly referred to as general impairment DUI under 75 Pa.C.S. § 3802(a)(1). Under that provision, a person may not drive, operate, or be in actual physical control of a vehicle after consuming enough alcohol that the person is rendered incapable of safely driving. Unlike the per se BAC provision, § 3802(a)(1) does not require the Commonwealth to establish that the driver’s BAC was 0.08% or higher. (Pennsylvania General Assembly)
For example, a driver could potentially have a BAC below 0.08% and still be arrested and charged if law enforcement believes there is sufficient evidence of impairment. The ultimate outcome of the case may depend on the totality of the evidence, including observations of the driver, driving behavior, field sobriety testing, chemical testing, and other circumstances surrounding the stop and arrest.
This distinction is important because being arrested or charged with DUI is not the same as being convicted of DUI. A person may have defenses to the charge, and a case involving a BAC below 0.08% may present significant factual or legal issues for the prosecution. Nevertheless, the individual may still have to go through the criminal court process to challenge the allegations.
The takeaway is simple: there is no universal rule that “one drink is safe” or that being under 0.08% means a person cannot be arrested for DUI in Pennsylvania. Every situation depends on its particular facts and circumstances.
This article is for general informational purposes only and is not intended to constitute legal advice. DUI cases are fact-specific, and past results do not guarantee future outcomes.
Montgomery 12/2016

