Is there a legal THC limit for driving in Pennsylvania?

No. Section 3802(d)(1) is a presence standard, not a threshold — any measurable amount of marijuana or its metabolite in your blood supports the charge, even if the use happened days earlier in a state where it was legal.

Can I be charged with DUI for a drug my doctor prescribed?

Yes, but on a different theory. Section 3802(d)(1)(ii) only reaches Schedule II and III drugs taken outside a valid prescription, so a properly used prescription defeats that count. The Commonwealth can still pursue § 3802(d)(2) if it can prove the medication actually impaired your ability to drive safely.

Why is a controlled-substance DUI sentenced at the highest tier?

Because § 3804(c) assigns § 3802(d) cases to the same penalty bracket as a Highest-BAC alcohol offense, without any graduated scale for how much of the drug was present. A trace metabolite case and a heavily impaired case begin at the same mandatory minimum.

Does a medical marijuana card protect me from a drug DUI charge in PA?

It removes the argument that your use was unlawful, but it does not bar prosecution. Charges under the § 3802(d)(2) impairment theory are still filed against certified patients, so the defense turns on the driving evidence and the absence of proof of actual impairment.

What happens to my license after a drug DUI arrest?

Two things run separately: PennDOT can impose a § 1547 suspension of 12 or 18 months for refusing the blood draw regardless of the criminal outcome, and a conviction under § 3802(d) carries its own 12- or 18-month suspension plus a year of ignition interlock after restoration.

Is ARD available for a drug DUI in Central Pennsylvania?

Usually, on a first offense with no accident, no minor in the vehicle, and no prior ARD within the § 3806 look-back. Drug DUI ARD conditions normally add a full drug and alcohol evaluation and any recommended treatment on top of the standard supervision period.

Drug Crimes · Drug DUI

A drug DUI is charged at the top tier — without any BAC number.

Pennsylvania's controlled-substance DUI does not require a breath test, a bad driving pattern, or even proof that the drug was still active. Under 75 Pa.C.S. § 3802(d)(1), any measurable amount of a Schedule I substance or its metabolite in your blood is enough to file, and § 3804(c) sentences it in the same bracket as a Highest-BAC alcohol case. The defense work happens in the blood draw, the lab, and the Drug Recognition Expert's opinion — not on a BAC chart.

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DUI — Controlled Substance in Pennsylvania.

Section 3802(d) creates four distinct theories: (d)(1) driving with any amount of a Schedule I controlled substance, or a Schedule II/III substance not taken under a valid prescription, or a metabolite of either, in your blood; (d)(2) driving under the influence of a drug or combination of drugs to a degree that impairs safe driving; (d)(3) driving under the combined influence of alcohol and drugs; and (d)(4) driving under the influence of a solvent or noxious substance. Grading follows 75 Pa.C.S. § 3803 — an ungraded misdemeanor with a six-month maximum on a first offense under § 3803(b)(2), a misdemeanor of the first degree on a second offense under § 3803(b)(4), a felony of the third degree on a third offense under § 3803(b)(4.1)(i), and a felony of the second degree at four or more under § 3803(b)(4.1)(ii), counted within the § 3806 ten-year look-back. Sentencing follows the § 3804(c) highest tier regardless of how much of the substance was present, which is why a metabolite-only case and a genuinely impaired-driving case start out on the same penalty page even though the proof problems are completely different.

Statute: 75 Pa.C.S. § 3802(d)[1] [2]

Diversion & record relief

First-offense drug DUI is ARD-eligible in Dauphin, Cumberland, York, and Adams counties under 75 Pa.C.S. § 3807, with a full drug and alcohol evaluation and treatment as recommended. Completion means dismissal and expungement rather than a highest-tier conviction.

PA drug court & diversion programs · ARD program lawyer · ARD eligibility quiz

DUI — Controlled Substance: offense grading and maximum exposure under 75 Pa.C.S. § 3802(d)
Offense & grading	Maximum exposure
First offense — § 3802(d), § 3804(c)(1) 12-month license suspension, 1 year of ignition interlock after restoration, and a mandatory drug and alcohol evaluation.	72 hours to 6 months jail, $1,000–$5,000 fine
Second offense — § 3804(c)(2) 18-month suspension, interlock, and a treatment condition; the § 3806 look-back is 10 years.	90 days to 5 years, $1,500 minimum fine
Third offense — § 3804(c)(3), § 3803(b)(4.1)(i) A third drug DUI is a felony, not a misdemeanor. Carries an 18-month suspension.	1 year mandatory minimum, $2,500 minimum fine; felony of the third degree, up to 7 years
Fourth or subsequent — § 3804(c)(3), § 3803(b)(4.1)(ii) Three or more prior offenses in the § 3806 look-back, with an 18-month suspension.	1 year mandatory minimum, $2,500 minimum fine; felony of the second degree, up to 10 years
Refusal of a blood draw — § 1547 A civil PennDOT suspension that applies even if the criminal case is later dismissed.	Adds a separate 12- or 18-month suspension
ARD disposition — § 3807 A mandatory 60-day suspension under § 3807(d)(3)(iv), because the charge is under § 3802(d), plus treatment as recommended and expungement once the program is completed.	No mandatory jail; dismissal on completion

Maximums are statutory ceilings, not expected sentences. Actual outcomes depend on prior record score, offense gravity score, treatment history, and county practice.

Jurisdiction & court process

Where a drug dui case is heard.

Preliminary hearing at the magisterial district court

A drug DUI starts at the local magisterial district court, often before the blood lab report has even come back. That timing matters: the Commonwealth only needs a prima facie case, but the hearing fixes the officer's testimony about the stop, the observations, and the consent language used before the blood draw — the record every later suppression motion is built on.

Court of Common Pleas — Dauphin, Cumberland, York, and Adams counties

Once held for court, the case moves to formal arraignment and pretrial conferences in the county Court of Common Pleas. Each county runs its own DUI-track scheduling, and each treats § 3802(d)(1) metabolite-only files differently from § 3802(d)(2) impairment files when it comes to plea posture and ARD conditions.

The blood lab and the DRE are separate fights

Prosecutors rely on two things: a Pennsylvania-approved laboratory result quantifying the substance or metabolite, and often a Drug Recognition Expert's 12-step evaluation. Chain of custody, the testing method, the reporting limit, and whether the DRE is qualified to give an opinion on impairment are all litigable — and they are litigated separately from the stop.

PennDOT runs on its own track

The criminal case and the license consequence run on separate tracks, and either one can take your license. A § 1547 refusal suspension is imposed administratively by PennDOT and has its own appeal deadline, which runs whether or not the criminal case is resolved. Expect a license consequence here: the suspension flows from the DUI or the refusal. What has changed is narrower than it sounds — the simple possession count that often accompanies a drug DUI no longer adds a suspension of its own, because Act 95 of 2018 removed controlled-substance convictions from 75 Pa.C.S. § 1532(c). That relief does not reach a felony: § 1532(a)(1) still requires a one-year suspension for any felony in which the court determines that a vehicle was essentially involved — which can include the DUI itself, because a third or subsequent § 3802(d) offense is graded a felony under § 3803(b)(4.1). A commercial driver convicted of using a motor vehicle in a felony involving the manufacture, distribution or dispensing of a controlled substance, or possession with intent to do so, faces lifetime disqualification under § 1611(e), with no exceptions or reductions.

How we defend drug dui cases.

Suppress the stop and the search
A drug DUI usually begins with a vehicle stop. After Commonwealth v. Alexander, a warrantless search of the car requires probable cause plus exigent circumstances, and a stop unsupported by reasonable suspicion takes the blood result with it.
Attack the blood draw and consent
Warrantless blood draws require valid consent or a warrant. Coercive implied-consent warnings, an unsigned form, or an unexplained delay between the stop and the draw are all grounds to exclude the result.
Separate metabolite from impairment
An inactive metabolite can persist for days or weeks after use. Under § 3802(d)(1) the Commonwealth needs presence, but it still has to prove the substance is one the statute covers and that the driver was operating — presence alone does not establish when the drug was consumed.
Challenge the DRE opinion
The 12-step DRE protocol is an officer's opinion, not a chemical test. Missing steps, pulse and eye-tracking findings inconsistent with the claimed drug category, and medical or fatigue explanations regularly undercut the evaluation.
Use a valid prescription
Section 3802(d)(1)(ii) reaches Schedule II and III substances only when they are not taken consistent with a valid prescription. A documented, properly used prescription defeats that theory and forces the Commonwealth onto the harder § 3802(d)(2) impairment case.
Address the medical-marijuana overlap
A Pennsylvania medical-marijuana card does not immunize a driver, and prosecutors still charge § 3802(d)(2) impairment. But the certification, dosing records, and the absence of any driving-impairment evidence are central to defeating that count.

Where we appear

Drug charge defense across Central Pennsylvania.

Attorney Quinlan appears in the magisterial district courts and Courts of Common Pleas in Dauphin, Cumberland, York, Adams, Perry, Franklin, and Lancaster counties. Start with your city:

Other drug charges we defend.

FAQ

Frequently asked questions.

Common questions about drug dui charges in Pennsylvania — grading, penalties, diversion, and record consequences.

No. Section 3802(d)(1) is a presence standard, not a threshold — any measurable amount of marijuana or its metabolite in your blood supports the charge, even if the use happened days earlier in a state where it was legal.
Yes, but on a different theory. Section 3802(d)(1)(ii) only reaches Schedule II and III drugs taken outside a valid prescription, so a properly used prescription defeats that count. The Commonwealth can still pursue § 3802(d)(2) if it can prove the medication actually impaired your ability to drive safely.
Through a blood draw analyzed by an approved laboratory for the substance or its metabolites, usually combined with a Drug Recognition Expert's 12-step evaluation covering pulse, eye tracking, muscle tone, and physical signs. Both the lab result and the DRE opinion are challengeable.
Because § 3804(c) assigns § 3802(d) cases to the same penalty bracket as a Highest-BAC alcohol offense, without any graduated scale for how much of the drug was present. A trace metabolite case and a heavily impaired case begin at the same mandatory minimum.
It removes the argument that your use was unlawful, but it does not bar prosecution. Charges under the § 3802(d)(2) impairment theory are still filed against certified patients, so the defense turns on the driving evidence and the absence of proof of actual impairment.
Two things run separately: PennDOT can impose a § 1547 suspension of 12 or 18 months for refusing the blood draw regardless of the criminal outcome, and a conviction under § 3802(d) carries its own 12- or 18-month suspension plus a year of ignition interlock after restoration.
Usually, on a first offense with no accident, no minor in the vehicle, and no prior ARD within the § 3806 look-back. Drug DUI ARD conditions normally add a full drug and alcohol evaluation and any recommended treatment on top of the standard supervision period.

[1]75 Pa.C.S. § 3802 — DUI — offense definitions and BAC/impairment tiers.
[2]75 Pa.C.S. § 3803 — Grading. For a violation of § 3802(c) or (d), or § 3802(a)(1) with a refusal: an ungraded misdemeanor with no prior offenses under § 3803(b)(2), a misdemeanor of the first degree with one prior under § 3803(b)(4), a felony of the third degree with two priors under § 3803(b)(4.1)(i), and a felony of the second degree with three or more under § 3803(b)(4.1)(ii).
[3]75 Pa.C.S. § 3804 — DUI penalty tiers, mandatory minimums, license suspension, ignition interlock.
[4]75 Pa.C.S. § 3806 — Prior-offense look-back rules. After Shifflett, ARD may not be used as a judge-found prior offense to enhance a § 3804 sentence; Act 58 separately created § 3802(h).
[5]75 Pa.C.S. § 3807 — Accelerated Rehabilitative Disposition (ARD) for DUI.
[6]75 Pa.C.S. § 1547 — Chemical testing and implied consent. A refusal suspension is 12 months under § 1547(b)(1)(i), or 18 months under § 1547(b)(1)(ii) where the person's operating privilege was previously suspended under § 1547(b) or the person was previously sentenced for § 3802, former § 3731, or an equivalent offense.
[7]Act of Oct. 24, 2018, P.L. 659, No. 95 — Removed controlled-substance convictions from 75 Pa.C.S. § 1532(c), ending Pennsylvania's automatic driver's-license suspension for a drug conviction. Approved October 24, 2018; effective in 180 days (approximately April 22, 2019). Narrower paths survive — see § 1532(a)(1), § 1611(a)(5) and § 1611(e).
[8]35 P.S. § 780-113(a)(16) — Knowing or intentional possession of a controlled substance by a person not registered to possess it — simple possession.
[9]Commonwealth v. Alexander, 243 A.3d 177 (Pa. 2020) — Rejected the federal automobile exception under the Pennsylvania Constitution — a warrantless vehicle search now requires probable cause plus exigent circumstances.
[10]75 Pa.C.S. § 1532(a)(1) — One-year suspension of the operating privilege on a conviction of, or an adjudication of delinquency based on, any felony in the commission of which a court determines that a vehicle was essentially involved. It survives the Act 95 of 2018 repeal.
[11]75 Pa.C.S. § 1611(e) — Lifetime disqualification from driving a commercial motor vehicle for a person convicted of using a motor vehicle in a felony involving the manufacture, distribution or dispensing of a controlled substance, or possession with intent to manufacture, distribute or dispense, where the person held a CDL at the time or the vehicle was a commercial motor vehicle. The statute allows no exceptions or reductions.
[12]75 Pa.C.S. § 1611(a)(5) — One-year disqualification from driving a commercial motor vehicle or school vehicle for a first violation consisting of any felony in the commission of which a court determines a motor vehicle was essentially involved, where the person was a commercial driver at the time — except where the lifetime disqualification in § 1611(e) applies instead.
[13]18 Pa.C.S. § 1103 — Sentences for felonies — F1 up to 20 years, F2 up to 10, F3 up to 7.

Statutes are summarized for public reference. Confirm current text at palegis.us. This page is attorney advertising, not legal advice.

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