“Methamphetamine” in the Controlled Substances Act Means the Generic Drug—No Isomer-by-Isomer Proof Required

1. Introduction

United States v. Glenn Wooden (7th Cir. Apr. 30, 2026) addresses a recurring “chemistry-based” defense in federal methamphetamine prosecutions: whether the government must prove the precise molecular/isomeric composition of “methamphetamine” to sustain convictions and mandatory minimum sentences under the Controlled Substances Act (“CSA”), 21 U.S.C. §§ 812 and 841.

Parties. The United States prosecuted Glenn D. Wooden for multiple controlled buys and possession with intent to distribute. Wooden (pro se at trial) argued that not all “methamphetamine” is illegal as a matter of federal law because, in his reading, the CSA reaches only “optical isomers” of methamphetamine.

Key issues. The appeal raised three principal questions:

  1. Statutory meaning: What does “methamphetamine” mean in the CSA schedules and penalty provisions?
  2. Trial consequences: Did the district court err by using the Seventh Circuit pattern instruction defining “methamphetamine” generically and by taking steps to counter Wooden’s “some meth is legal” theme?
  3. Sentencing/quantity proof: Was the evidence sufficient to support the drug quantity findings triggering mandatory minimums?

A further evidentiary issue concerned whether the DEA chemist functioned as a “dual-role” witness requiring special safeguards.

2. Summary of the Opinion

The Seventh Circuit affirmed. The court held that “[a]ll methamphetamine is illegal under federal law” in the relevant sense: the CSA uses “methamphetamine” as a generic term for the stimulant drug commonly understood as methamphetamine (including d-, l-, and dl- forms used for stimulant effects), rather than requiring the government to prove the presence of particular “optical isomers” as an element of the offense.

Accordingly:

  • The district court properly used the Seventh Circuit pattern instruction employing “methamphetamine” generically.
  • The evidence (including lab testing showing high-purity d-methamphetamine hydrochloride) was sufficient for conviction and mandatory minimum quantities.
  • No “dual-role witness” safeguards were required for the DEA chemist, who testified as an expert about testing and weights.

3. Analysis

3.1. Precedents Cited (and How They Shaped the Decision)

A. Standard of review and preservation

  • United States v. Bonin, 932 F.3d 523, 537-38 (7th Cir. 2019): supplied the de novo standard for whether instructions correctly state the law. This permitted the panel to directly address the core legal premise: what the CSA means by “methamphetamine.”
  • United States v. Godinez, 7 F.4th 628, 638 (7th Cir. 2021): framed de novo review for sufficiency challenges preserved by a Rule 29 motion. That mattered because Wooden did preserve his sufficiency argument in a post-trial motion for acquittal.
  • United States v. Thomas, 970 F.3d 809, 816 (7th Cir. 2020): used to resist an overbroad finding of waiver based on a “rote” colloquy. The court relied on Thomas to justify reaching Wooden’s instruction challenge despite Wooden’s “no objection” response at the instruction conference.
  • Bradley v. Village of University Park, 59 F.4th 887, 895 (7th Cir. 2023) and United States v. Johnson, 47 F.4th 535, 542 n.2 (7th Cir. 2022): provided the doctrinal definitions of waiver (intentional relinquishment) and forfeiture (failure to timely specify objection). These cases supported the panel’s conclusion that, given Wooden’s persistent “isomer” argument throughout trial, de novo review was appropriate.

B. Statutory interpretation method

  • Hulce v. Zipongo, Inc., 132 F.4th 493, 497-98 (7th Cir. 2025) (quoting Delaware v. Pennsylvania, 598 U.S. 115, 128 (2023)): anchored the “ordinary, contemporary, common meaning” approach—crucially pegged to the time of enactment. This allowed the court to consult contemporaneous dictionaries, regulatory history, and public usage around 1970 (and 1988 for the mandatory minimum amendments).
  • Wis. Cent. Ltd. v. United States, 585 U.S. 274, 277-80 (2018): confirmed that older statutes may be interpreted with reference to dictionaries and historical context. The Wooden panel drew directly on this permission to use 1970s dictionary definitions and the pre-CSA regulatory framework.
  • United States v. Hyatt, 28 F.4th 776, 783 (7th Cir. 2022) (citing SCALIA & GARNER): supplied the anti-surplusage canon—every word should be given effect. This canon drove the court’s rejection of Wooden’s reading of “including” as a limitation that effectively read “methamphetamine” out of the statute.

C. Methamphetamine isomer discussion in prior Seventh Circuit cases

  • United States v. McEntire, 153 F.3d 424, 431 (7th Cir. 1998): cited for the proposition that d-methamphetamine is the valuable psychoactive form, while l-methamphetamine has little or no physiological effect. Wooden used the “isomer” framing to argue only some meth is illegal; the panel used McEntire to show the court’s familiarity with isomer distinctions while still rejecting the notion that the CSA requires isomer-specific proof for guilt.

D. The “categorical approach” cases Wooden relied upon (distinguished)

  • United States v. De La Torre, 940 F.3d 938, 951 (7th Cir. 2019): in the categorical approach context, De La Torre compared Indiana’s statute with federal law and emphasized the CSA’s definition that “‘isomer’ means the optical isomer.” Wooden treated De La Torre as if it redefined “methamphetamine” federally to mean only optical isomers. The panel rejected that move, explaining De La Torre was addressing the breadth of “isomer” language in state versus federal statutes, not redefining “methamphetamine” itself.
  • Aguirre-Zuniga v. Garland, 37 F.4th 446, 451-53 (7th Cir. 2022): similarly categorical, focused on whether Indiana law swept more broadly because it did not define “isomer.” The Wooden panel emphasized that Aguirre-Zuniga’s discussion aimed to prevent rendering a state statute “impotent,” not to impose an isomer-identification element in federal prosecutions.
  • United States v. Turner, 47 F.4th 509, 520 (7th Cir. 2022): quoted for the proposition that “Federal law … criminalized only optical isomers of methamphetamine.” The Wooden panel treated this as shorthand arising in categorical-comparison analysis, not as an operative holding about the elements of § 841 offenses.

E. Cross-circuit and historical authority confirming generic treatment

  • United States v. DeJulius, 121 F.3d 891, 893-95 (3d Cir. 1997): the most directly supportive external authority. DeJulius held that for § 841 mandatory minimums “it makes no difference” whether the substance is D-, L-, or DL-methamphetamine. Wooden aligns with DeJulius, adopting its plain-language reasoning that § 841 makes no isomeric distinction in the way Wooden demands.
  • United States v. Bogusz, 43 F.3d 82, 86-92 (3d Cir. 1994) and United States v. Patrick, 983 F.2d 206, 208-11 (11th Cir. 1993) (plus United States v. Carroll, 6 F.3d 735, 742-43 (11th Cir. 1993)): used to illustrate that isomer distinctions arose primarily from earlier Sentencing Guidelines drug tables, not from the CSA’s offense elements. The Wooden panel leveraged these cases to show that even when isomer-specific sentencing issues mattered, convictions still rested on generic “methamphetamine.”
  • Multiple early § 841 cases (e.g., United States v. Cannon, United States v. Olson, United States v. Santillo, United States v. Thor, and Dunn v. United States) were cited to demonstrate the longstanding judicial assumption that “methamphetamine” is treated generically in prosecutions.

F. Expert/dual-role testimony safeguards

  • United States v. Bard, 73 F.4th 464, 477 (7th Cir. 2023) and United States v. Jett, 908 F.3d 252, 269-70 (7th Cir. 2018): define the “dual-role witness” concern and the management protocol, typically for law enforcement witnesses mixing lay narrative and expert opinion. Wooden argued the DEA chemist required Jett safeguards. The court held that a chemist testifying to testing and weights is testifying as an expert, not a dual-role witness in the Jett sense, and declined to extend Jett procedures to that context.
  • United States v. Gan, 54 F.4th 467, 477 (7th Cir. 2022): cited to contextualize Jett as focused on dual-role law enforcement testimony, reinforcing the limitation.
  • United States v. Edwards, 34 F.4th 570, 588 (7th Cir. 2022): used to reject cumulative-error arguments absent at least two actual errors.

3.2. Legal Reasoning

A. Textual structure: “methamphetamine” versus “its salts, isomers, and salts of isomers”

The opinion’s central move is to treat the statutory phrase “including its salts, isomers, and salts of isomers” as illustrative, not definitional. Under 21 U.S.C. § 812, Congress controlled “any substance … which contains any quantity of methamphetamine,” and then clarified that the term’s reach also covers salts and isomers—common chemical variants by which a drug may appear in commerce.

Wooden’s reading would invert that relationship by turning the “including” clause into a limiting definition, which the court rejected for three textual reasons:

  1. No definitional signal: Congress defined many terms in § 802, but did not define “methamphetamine,” suggesting it used the term in its ordinary sense.
  2. Anti-surplusage: Wooden’s approach effectively reads “methamphetamine” out of the statute by making the offense depend solely on “isomers,” contrary to United States v. Hyatt’s directive to give each word effect.
  3. Consistency across provisions: Section 841 separately refers to “methamphetamine” and “its salts, isomers, and salts of isomers.” If “methamphetamine” already meant “optical isomers,” the statute would become redundantly self-referential.

B. Ordinary meaning at enactment: historical dictionaries, regulation, and public usage

Applying Hulce v. Zipongo, Inc. and Wis. Cent. Ltd. v. United States, the court examined how “methamphetamine” was understood in 1970. The opinion marshals three mutually reinforcing historical sources:

  • Regulatory backdrop (FDA pre-CSA): The FDA’s 1960s regulations could and did specify “d-, dl- Methamphetamine,” showing that technical specificity was available. Congress nevertheless chose a generic name in the CSA—suggesting breadth, not narrowness.
  • Public and medical usage: Contemporary reporting (e.g., a 1969 New York Times column) treated “methamphetamine” as a drug-family label tied to brand names and street names, not a term requiring isomer-by-isomer parsing for ordinary understanding.
  • Dictionaries (1970s and 1988): Definitions described methamphetamine as an amine (C10H15N) used as a CNS stimulant, typically in hydrochloride form, again pointing to a general drug identity rather than an isomer-element.

From these sources, the court articulated a functional definition: “methamphetamine” in the CSA refers to the forms of C10H15N commonly used for their stimulating effects. That reading captures the illicit market reality Congress was regulating while remaining grounded in historical semantics.

C. Doctrinal reconciliation: why “categorical approach” language does not rewrite § 841 elements

The opinion draws a sharp line between:

  • Element interpretation (what the federal statute requires the government to prove in a prosecution), and
  • Categorical comparison (whether a state statute sweeps more broadly than a federal definition for predicate-offense purposes).

Wooden attempted to convert categorical-approach shorthand into an elements rule. The panel rejected this as a category error: United States v. De La Torre and Aguirre-Zuniga v. Garland addressed how the CSA’s definition of “isomer” (optical isomer) affects overbreadth analysis, not whether “methamphetamine” itself must be proven by isolating optical isomers at trial.

D. Practical administration: lab testing and proof burdens

The court emphasized administrability and entrenched forensic practice. DEA standard operating procedures require two tests to identify methamphetamine and assess purity/salt form, while isomer-specific testing is performed only upon request. Wooden’s reading would effectively mandate isomer testing in every case, a significant change the court found unsupported by statutory text and inconsistent with decades of prosecutions.

E. Expert testimony: chemists are experts, not “dual-role” narrators

On the “dual-role witness” claim, the court treated a lab chemist testifying about tests he performed and results he obtained as straightforward expert testimony, not the kind of hybrid lay/expert policing narrative that triggers United States v. Jett safeguards. Applying plain-error review (because Wooden did not object at trial), the court found no error—indeed, no reason to extend Jett’s protocol to this context.

3.3. Impact

A. Closing the door on “isomer-element” defenses in CSA meth cases

The opinion’s most significant doctrinal effect is to definitively state—within the Seventh Circuit—that the CSA’s use of “methamphetamine” is generic for purposes of:

  • convictions under § 841(a)(1), and
  • mandatory minimum thresholds under § 841(b)(1).

Future defendants seeking acquittal or instruction error based on the government’s failure to prove d- versus l- versus dl- composition should face a steep uphill battle, because the court framed Wooden’s position as a misreading that would “rewrite the statute and upend decades of precedent.”

B. Clarifying the reach of categorical approach language

Wooden reduces the risk that litigants will cite United States v. De La Torre and Aguirre-Zuniga v. Garland out of context. The opinion expressly confines those decisions to the predicate-offense/overbreadth inquiry and rejects their use as a backdoor redefinition of § 841 elements.

C. Evidentiary practice: limits on Jett safeguards

By holding that a chemist describing drug testing is not a “dual-role witness” requiring United States v. Jett procedures, the court reduces the likelihood of future challenges demanding special jury instructions or segmented testimony for laboratory experts. The practical effect is to preserve the common structure of federal drug trials: lab experts testify as experts about methods, identification, and weights without “dual-role” framing.

4. Complex Concepts Simplified

Controlled Substances Act schedules (21 U.S.C. § 812)
A statutory list of drugs that are “controlled,” meaning their manufacture/distribution is regulated and generally illegal outside authorized channels. Methamphetamine is controlled by name, and the schedules also mention “salts” and “isomers” to capture common chemical variants.
Isomers (optical vs. positional/geometric)
Isomers are molecules with the same chemical formula but arranged differently. “Optical isomers” are mirror-image pairs (like left and right hands). The CSA defines “isomer” (for this context) to mean “optical isomer,” but that does not mean “methamphetamine” itself is only “optical isomers.”
d- vs. l- methamphetamine; dl mixture
d-methamphetamine is the potent stimulant commonly sought in illicit markets. l-methamphetamine is far less psychoactive and has appeared in some OTC products. dl-methamphetamine is a mixture containing both. Wooden holds that the CSA’s use of “methamphetamine” is broad enough to cover the drug as commonly understood, not limited to one isomer for purposes of proving guilt.
“Methamphetamine (actual)” and “ice” (Sentencing Guidelines)
These are sentencing concepts tied to purity and form under U.S.S.G. § 2D1.1. They can affect guideline calculations, but Wooden emphasizes that the statutory offense element remains “methamphetamine” generically under § 841.
Categorical approach
A method used to decide whether a prior conviction qualifies as a predicate offense by comparing the elements of the prior statute to a federal definition. Wooden explains that categorical-approach statements about “isomers” do not transform what the government must prove in a live federal § 841 prosecution.
Dual-role witness
A witness (often law enforcement) who mixes lay testimony about investigation facts with expert opinions, risking jury confusion. Wooden holds a lab chemist testifying about testing and results is an expert witness, not the kind of dual-role witness that triggers special safeguards.

5. Conclusion

United States v. Glenn Wooden establishes a clear and administrable rule: in the CSA, “methamphetamine” is a generic statutory term covering the stimulant drug as commonly understood, and the government is not required to prove the substance’s precise optical-isomer composition to obtain convictions or mandatory minimum sentences under 21 U.S.C. §§ 812 and 841.

The opinion also cabins the reach of Seventh Circuit categorical-approach cases—United States v. De La Torre and Aguirre-Zuniga v. Garland—to their proper domain, and it declines to extend United States v. Jett “dual-role” safeguards to DEA chemists testifying as experts about laboratory testing.

In broader legal context, Wooden reinforces a historically grounded, text-centered method of statutory interpretation while preserving long-settled prosecutorial and forensic practices in federal drug cases.