Drug DWI — Fentanyl / Opioid Impairment
Va. Code § 18.2-266(iii)/(iv) — Trial Reference
1. Threshold Trap — Per Se vs. Impairment Theory
| Substance | Available Theory | Key Requirement |
|---|---|---|
| Fentanyl / opioids | Clause (iii), or (iv) with alcohol — impairment only | Blood result + DRE evaluation + officer observations of impairment; no per se level |
| Cocaine | Clause (v) per se OR impairment | Per se: blood ≥ 0.02 mg/L of COCAINE under § 18.2-266(v)(a). The statute names cocaine only — it sets no figure for benzoylecgonine or any other metabolite |
| Methamphetamine | Clause (v) per se OR impairment | Per se: blood ≥ 0.1 mg/L under § 18.2-266(v)(b) |
| PCP (phencyclidine) | Clause (v) per se OR impairment | Per se: blood ≥ 0.01 mg/L under § 18.2-266(v)(c) |
| MDMA (3,4-methylenedioxymethamphetamine) | Clause (v) per se OR impairment | Per se: blood ≥ 0.1 mg/L under § 18.2-266(v)(d) |
| Alcohol + fentanyl combination | Clause (iv) — combined influence | Combination of alcohol and drug(s) together impairs safe driving — can use both the BAC and the opioid blood result |
2. Elements — Prong (iii)/(iv) Impairment Theory
| Element | What to Prove | Evidence Sources |
|---|---|---|
| 1. Operation | Defendant operated a motor vehicle | Officer observation, witnesses, defendant's admissions, accident scene linkage |
| 2. Public highway | On a highway or area open to public vehicular traffic | Officer's description of stop location; broad construction includes public parking lots |
| 3. Under the influence of a drug | A self-administered controlled substance or other drug (prong iii/iv) impaired the defendant's ability to drive safely | DRE evaluation, blood toxicology showing fentanyl/metabolite, officer driving observations, FST performance, physical impairment signs |
| 4. Impairment caused unsafe driving | The drug impaired the defendant's ability to operate a vehicle safely | Driving pattern (lane departure, erratic speed, accidents), DRE opinion, toxicologist opinion |
3. Evidence-Building Ladder — Three Rungs
Rung 1 — Lay / Responding Officer
- Driving observations Swerving, lane departure, speed variation, failure to maintain lane, failure to respond to signals, erratic or extremely slow driving.
- Physical signs at contact Pinpoint (miotic) pupils — classic opioid sign; nodding off / microsleep; slurred or slow speech; drooping eyelids; slow or absent reactions; limp muscle tone; pale or flushed skin.
- Scene evidence Syringes, pill bottles, foil, cotton, burn marks, narcotics in the vehicle or on the defendant's person.
- Vital signs baseline If EMT/medical on scene, pulse and respiration rate (opioid slows both). This information is later provided to the DRE.
- Statements Any admission of recent drug use, the type of drug, when last used, or prescription claims.
Rung 2 — Drug Recognition Expert (DRE)
- 12-step DRE evaluation protocol Breath test (to rule out alcohol alone); pulse; HGN; lack of convergence; four divided attention tests; pupil examination in three light conditions; vital signs (BP, pulse, temperature); dark room pupil exam; muscle tone; injection sites; DRE opinion.
- DRE opinion The DRE can opine that the defendant is impaired and that the impairment is consistent with a CNS depressant (opioid category). The opinion is admissible in Virginia courts when the DRE is properly qualified and followed the protocol.
- Foundation for admissibility DRE must be certified by the International Association of Chiefs of Police (IACP) program; must have completed the 72-hour DRE school and field certifications; must have performed the full 12-step protocol.
- Limitation — DRE identifies category, not specific drug The DRE can identify the drug category (CNS depressant, narcotic analgesic) but cannot identify the specific substance. The blood test provides the specific substance confirmation.
Rung 3 — DFS Toxicologist
- Fentanyl blood level quantification DFS reports fentanyl (and norfentanyl metabolite) in ng/mL. The toxicologist explains what these levels mean and whether they are consistent with impairment at the time of operation.
- Timing — when was the blood drawn? Fentanyl peaks quickly and distributes to tissues. A blood draw hours after the offense may show lower levels than at the time of operation. The toxicologist can opine on timing, but the defense will raise this — be prepared.
- Impairment opinion The toxicologist can opine that the detected blood concentration, combined with the observed signs, is consistent with impairment of the kind that would affect driving. Ensure the toxicologist has reviewed the officer's and DRE's observations before trial.
- Metabolite (norfentanyl) Norfentanyl is the primary metabolite and indicates recent fentanyl use — but norfentanyl itself is not pharmacologically active. Its presence corroborates fentanyl exposure but does not independently prove impairment.
5. Tolerance Cross — Defense Attacks & Responses
| Defense attack | Prosecution response |
|---|---|
| Tolerance — the defendant uses fentanyl regularly and is not impaired at this blood level | Tolerance reduces but does not eliminate impairment. The officer's firsthand observations of actual impaired driving (swerving, nodding off, microsleep) and the DRE's observed physical signs are independent of the blood level. Even tolerant users show observable impairment at sufficient doses. The toxicologist can address tolerance in their opinion. |
| Post-peak timing — blood was drawn hours later; the level was higher at the time of driving | This cuts both ways — if the defendant is past peak, the level at the time of driving may have been higher, not lower. The toxicologist addresses timing. The officer's real-time observations are the most direct evidence of impairment at the time of driving. |
| Norfentanyl only — active drug already metabolized, no current impairment | Norfentanyl confirms recent fentanyl exposure but is not itself active. The question is whether the parent drug was present at the time of operation — the blood draw timing and the driving observations address this. The DRE observed active physical signs at the time of the evaluation. |
| Prescription fentanyl — defendant was taking it as directed | A valid prescription does not authorize impaired driving. Prong (iii) covers self-administered drugs and prong (iv) covers controlled substances — neither requires proof of illegal possession. Prescribed use of an impairing drug is still a DWI if the defendant was actually impaired. |
6. Pre-Trial Checklist
- Blood draw — warrant obtained or exigency documented; qualified draw person under § 18.2-268.5
- DFS COA obtained; toxicology report identifies fentanyl and/or norfentanyl with ng/mL levels
- DFS COA: 7-day PH filing or 28-day trial notice tracked and calendared
- DRE: officer is IACP-certified and performed the full 12-step evaluation; documentation obtained
- DRE documentation: 12-step form completed, signed, and available for disclosure
- DRE opinion on record: impairment category identified as CNS depressant / narcotic analgesic
- Driving observations documented: specific acts of impaired driving in the officer's narrative
- Physical signs documented: pinpoint pupils, nodding off, slow speech, limp muscle tone
- Toxicologist prepared to opine on: blood level significance, timing, and impairment
- Prescription defense anticipated: confirm defendant was not impaired within prescribed use
7. Watch-Outs — Reality Checks
8. Annotated Authority
Annotated authority — research layer, not printed on the PDF
Spencer v. Commonwealth 240 Va. 78, 97-98, 393 S.E.2d 609, Va., 1990
THE VIRGINIA STANDARD, and it is neither Frye nor Daubert. "WE HAVE DECLINED TO ADOPT THE 'FRYE TEST' IN VIRGINIA." Instead, "[w]hen scientific evidence is offered, the court must make A THRESHOLD FINDING OF FACT WITH RESPECT TO THE RELIABILITY OF THE SCIENTIFIC METHOD offered, unless it is of a kind SO FAMILIAR AND ACCEPTED as to require no foundation to establish the fundamental reliability of the system, such as fingerprint analysis," or so unreliable "that the considerations requiring its exclusion have RIPENED INTO RULES OF LAW, such as 'lie-detector' tests." Once admitted, the jury weighs reliability in determining credibility and weight.
Practical value: ⚠️ THIS SHEET USED TO SAY "Virginia uses the Frye/Daubert-like standard." IT DOES NOT. Frye was expressly declined, and no authority on this sheet establishes that Virginia follows Daubert either. The question at the threshold is the RELIABILITY OF THE METHOD, found as a fact by the judge — so build the record on how the toxicology was done, not on the four Daubert factors. The two exceptions are the practical ones: methods "so familiar and accepted" that no foundation is needed (fingerprints), and methods excluded as a matter of law (polygraph). Novel opioid-impairment testimony is in neither category and needs a foundation.
O'Dell v. Commonwealth 234 Va. 672, 695-97, 364 S.E.2d 491, 504, Va., 1988
The earlier authority Spencer cites for Virginia's refusal to adopt the Frye general-acceptance test. Cert. denied, 488 U.S. 871 (1988).
Practical value: Worth citing with Spencer to show the refusal is settled and not a one-case aberration.
Spencer v. Commonwealth (Spencer III) 238 Va. 563, 573 n.5, 385 S.E.2d 850, 856 n.5, Va., 1989
The footnote in the third Spencer appeal recording the same point — Virginia has not adopted Frye.
Practical value: ⚠️ NAME AND CITATION COLLISION WITHIN ONE DEFENDANT'S APPEALS. This is a DIFFERENT Spencer decision from 240 Va. 78 — same defendant, consecutive volumes. Check the volume before citing.
Birchfield v. North Dakota 579 U.S. 438, U.S., 2016
"Because breath tests are significantly less intrusive than blood tests and in most cases amply serve law enforcement interests, we conclude that A BREATH TEST, BUT NOT A BLOOD TEST, MAY BE ADMINISTERED AS A SEARCH INCIDENT TO A LAWFUL ARREST for drunk driving." And "MOTORISTS CANNOT BE DEEMED TO HAVE CONSENTED to submit to A BLOOD TEST ON PAIN OF COMMITTING A CRIMINAL OFFENSE."
Practical value: This sheet turns on blood, because a breath test detects nothing in an opioid case. So the first holding is the wrong half to rely on and the second is the live one: implied consent will not carry the draw. GET A WARRANT.
Missouri v. McNeely 569 U.S. 141, U.S., 2013
Natural metabolization is NOT A PER SE EXIGENCY. Dissipation "may support an exigency finding in a specific case, as it did in Schmerber, BUT IT DOES NOT DO SO CATEGORICALLY" — the question is the TOTALITY OF THE CIRCUMSTANCES.
Practical value: "The drug was disappearing" is not an argument on its own. Put on the specific delay: how long a warrant would actually have taken that night, with that magistrate.
Mitchell v. Wisconsin 588 U.S. 840, U.S. (plurality), 2019
⚠️ A PLURALITY. Justice Alito "announced the judgment of the Court and delivered an opinion" joined by three others; Justice Thomas concurred IN THE JUDGMENT ONLY. Where unconsciousness or stupor "requires him to be taken to the hospital or similar facility before police have a reasonable opportunity to administer a standard evidentiary breath test, they may ALMOST ALWAYS order a warrantless blood test." The judgment was "VACATED, AND THE CASE IS REMANDED."
Practical value: ⚠️ THE SHEET STATED IT AS "generally permitted". This is the FOURTH sheet in this corpus on which Mitchell was written up as settled law — see dui-266 and dui-suspension. It is not a majority, "almost always" carries an express defence rebuttal, and the Court did not uphold the draw. It matters most here, because unconsciousness is the ordinary presentation in an opioid case, and that is exactly when the defence will demand the Mitchell showing.
Melendez-Diaz v. Massachusetts 557 U.S. 305, 310, U.S., 2009
Analyst certificates "are quite plainly affidavits" and "fall within the core class of TESTIMONIAL STATEMENTS" governed by the Confrontation Clause, so the analyst must testify on a proper demand.
Practical value: In Virginia the mechanism is § 19.2-187.1 and the deadline is the whole case. On a fentanyl sheet the toxicology report IS the case, so calendar the demand window and secure the analyst early. ⚠️ Compare JASPER and BOONE on the dui-suspension sheet, where a DMV transcript was held NOT testimonial: the line is whether the record was PREPARED FOR LITIGATION. A DFS certificate plainly is.
⚠️ THREE CASE ENTRIES WERE REMOVED ON 2026-08-24 as unverifiable, and the Daubert entry was corrected. Only SEVEN annotations follow, not the usual ten — see the revision notes for what is now uncited on this sheet.