Pennsylvania DUI Laws

Pennsylvania DUI has two paths. Under the general-impairment prong (§3802(a)(1)) you can be convicted with no BAC number at all — the Commonwealth need only prove you drove after imbibing enough alcohol to render you "incapable of safely driving," so a reading under 0.08 (or no test at all) does not automatically clear you. Separately, three per-se tiers key off measured BAC within two hours of driving: General Impairment (§3802(a)(2), 0.08% to less than 0.10%), High Rate (§3802(b), 0.10% to less than 0.16%), and Highest Rate (§3802(c), 0.16% and higher). The tier you land in drives the entire penalty grid. Commercial drivers face a lower 0.04% threshold under §3802(f).

Pennsylvania sets a 0.02% BAC threshold for drivers under 21 under §3802(e) — far below the adult 0.08% per-se limit. Importantly, the 0.02% rule is additive, not a cap: it lowers the floor for under-21 drivers, but a driver under 21 who measures into the adult tiers (0.08%, 0.10%, or 0.16% and higher) also faces those adult tiers and their heavier penalties. A §3802(e) violation is penalized at the High-Rate tier under §3804(b).

Section 3802(d) is not a single "any drug" rule — it has distinct sub-clauses: §3802(d)(1) reaches Schedule I controlled substances and their metabolites; §3802(d)(2) reaches driving impaired by a drug or combination of drugs to a degree that impairs safe driving; and §3802(d)(3) reaches combined alcohol-and-drug impairment. A controlled-substance DUI under §3802(d) is penalized at the Highest-Rate tier under §3804(c) regardless of any measured BAC, so the per-se blood-alcohol mental model does not transfer to drug cases. This is a separate trigger from chemical-test refusal, which also maps to the Highest-Rate tier.

First-offense penalties vary by BAC tier — they are not a single number. A General-Impairment first offense (§3804(a)(1)) is an ungraded misdemeanor with no mandatory jail, six months’ probation, a $300 fine, alcohol highway safety school, and no license suspension. A High-Rate first offense (§3804(b)(1)) carries a 48-consecutive-hour minimum jail term, a $500–$5,000 fine, and a 12-month suspension. A Highest-Rate, refusal, or §3802(d) drug first offense (§3804(c)(1)) carries a 72-consecutive-hour minimum, a $1,000–$5,000 fine, and a 12-month suspension. So "no jail for a first DUI" is true only at the General-Impairment tier. Most eligible first offenders resolve through ARD, a discretionary pre-trial diversion program — see pennsylvania-faq-10.

A second offense requires a prior offense within the §3806 10-year window, and the mandatory-minimum jail floor rises by tier: 5 days at General Impairment (§3804(a)(2)), 30 days at High Rate (§3804(b)(2)), and 90 days at Highest Rate, refusal, or §3802(d) drugs (§3804(c)(2)), with fines escalating accordingly. Ignition interlock is mandatory at a second offense under §3805, and the license suspension runs 12 to 18 months depending on grading. Note the 2025 change: a DUI committed within 10 years of completing ARD is now charged under §3802(h) ("DUI following diversion") and graded like a second offense, with the prior ARD completion proven beyond a reasonable doubt — replacing the superseded rule that treated ARD acceptance as a prior (Commonwealth v. Shifflett, Pa. 2025).

Pennsylvania graded all repeat DUIs as misdemeanors until Act 153 of 2018 (effective December 23, 2018) created felony DUI — so not every repeat offense is a felony. A DUI is a felony of the third degree when it is a third offense at the Highest-Rate tier (or with refusal / §3802(d) drugs), or a fourth-or-subsequent offense at any tier (§3803). Act 59 of 2022 ("Deana’s Law") escalated a Highest-Rate, refusal, or drug offense with three or more prior offenses to a felony of the second degree and required consecutive sentencing for offenders with two or more priors. Causing serious injury or death while DUI is charged under separate, more serious statutes — aggravated assault by vehicle while DUI (§3735.1) and homicide by vehicle while DUI (§3735), each a felony of the second degree with its own grading — not as an ordinary DUI tier. A §3802(h) "DUI following diversion" charge can itself reach felony grading at the higher tiers.

Pennsylvania uses a 10-year lookback under §3806, measured offense-to-offense: a prior offense counts if it occurred within 10 years prior to the date of the current offense (not conviction-to-conviction). The court calculates the number of prior offenses at the time of sentencing (§3806(b)(2)), and an "on or after" rule (§3806(b)(1)) addresses intervening offenses. On the ARD interaction, current law controls: acceptance of ARD is no longer counted as a §3806 prior offense for sentence enhancement (Commonwealth v. Shifflett, 335 A.3d 1158 (Pa. 2025)). Instead, a DUI committed within 10 years of completing ARD is charged as the separate offense "DUI following diversion" under §3802(h) (Act 58 of 2025) and graded like a repeat offense — see pennsylvania-faq-10.

Suspension length is keyed to BAC tier and prior count under §3804(e). A General-Impairment first offense with no prior carries no suspension; a first-offense High-Rate or Highest-Rate DUI carries a 12-month suspension; and repeat or more serious offenses carry 12- or 18-month suspensions. These are suspensions (the privilege reinstates after the period and reinstatement requirements are met), not revocations. You may be able to drive during suspension through the ignition interlock limited license — see pennsylvania-faq-9. If you are licensed in another state, Pennsylvania participates in the Driver’s License Compact (§1581), under which a Pennsylvania DUI conviction may be reported to your home state.

For a DUI suspension, the Occupational Limited License (OLL, §1553) is NOT available — §1553(a)(1) expressly excludes suspensions for a §3802 DUI or a §1547 chemical-test refusal from OLL eligibility. The operative relief is the Ignition Interlock Limited License (IILL, §1556), which lets you drive a vehicle equipped with an approved ignition interlock device during your suspension if you qualify. The IILL is a conditional grant with eligibility requirements, not an automatic entitlement, and it requires installing and maintaining the interlock device at your expense.

Accelerated Rehabilitative Disposition (ARD) is a county-district-attorney-discretionary pre-trial diversion program (§3807; Pa.R.Crim.P. 300–320) that is the dominant first-offender path in Pennsylvania DUI cases. It is not an entitlement — admission is at the DA’s discretion and is generally unavailable where there was an accident causing serious injury or death, a passenger under 14 years of age (§3807(a)(2)(iii)), or a prior ARD or DUI within ten years. On successful completion the charges are dismissed and you become eligible to petition for expungement (which is not automatic). The most important current-law point: acceptance of ARD is no longer counted as a prior offense to enhance a later DUI sentence (Commonwealth v. Shifflett, Pa. 2025); instead, under Act 58 of 2025 a DUI committed within 10 years of COMPLETING ARD is the separate offense "DUI following diversion" (§3802(h)), graded like a repeat offense with the prior completion proven beyond a reasonable doubt. PennDOT records both acceptance and completion (§1534(b)/(b.1)) and the clerk of courts retains the completion order for 12 years for that purpose (§3807(f)(2)).

Two separate consequences flow from refusal. First, administrative: under §1547(b), PennDOT suspends your license for refusing chemical testing — 12 months for a first refusal, 18 months if you have a prior refusal or qualifying DUI — and this applies to refusal of ANY chemical test (breath or blood, with or without a warrant), unaffected by Birchfield. Second, criminal: §3804(c) penalizes a refusing DUI defendant at the Highest-Rate tier regardless of measured BAC. On its face §3804(c) reaches a §3802(a)(1) driver who refused a breath test under §1547 OR who refused a blood test taken pursuant to a valid search warrant — so a warrant-backed blood refusal DOES carry the criminal enhancement. What it cannot rest on, after Birchfield v. North Dakota (2016) and Commonwealth v. Myers (Pa. 2017), is refusal of a WARRANTLESS blood draw. The two tracks must not be conflated: the §1547 administrative suspension survives even a warrantless-blood refusal, while the §3804(c) criminal enhancement requires breath refusal or warrant-backed blood refusal. Pennsylvania also allows your refusal to be used as evidence against you at trial (§1547(e); Commonwealth v. Bell, Pa. 2019).

Under §3805, ignition interlock is required at restoration for essentially every DUI except one narrow class: §3805(a.1) exempts a General-Impairment first offender (§3804(a)(1)) with no prior offense and no ARD completed in the prior 10 years. So a first-offense High-Rate, Highest-Rate, refusal, or §3802(d) drug driver needs an interlock, while the modal General-Impairment first offender does not. Any second or subsequent offense fails the "no prior offense" condition, so interlock is mandatory at every repeat tier. The restricted-license period runs one year from issuance (§3805(c)), and the ignition interlock limited license (§1556) is the path to drive during suspension — see pennsylvania-faq-9.