“When” Means “At Least When”: Article III, Section 45 Does Not Bar Mid‑Decade Congressional Redistricting in Missouri

Case: Merri Suzanne Luther, et al. v. Denny Hoskins (with Missouri State Republican Committee as respondent)
Court: Supreme Court of Missouri (en banc)
Date: March 24, 2026
Disposition: Circuit court affirmed; HB 1 upheld.

1. Introduction

This appeal asked whether the Missouri Constitution permits the General Assembly to redraw Missouri’s congressional districts mid‑decade—i.e., without waiting for a new decennial census to be certified to the governor. After the 2020 census was certified to the governor in August 2021, the General Assembly enacted congressional districts in 2022. In September 2025, the General Assembly enacted House Bill 1 (“HB 1”), which repealed the 2022 map and adopted a new map even though no new census had been certified.

Appellants (four individuals) filed a declaratory judgment action asserting HB 1 violates Mo. Const. art. III, § 45 because § 45 states the General Assembly shall redistrict “[w]hen” the census is certified to the governor. Their theory was not that the constitution expressly forbids mid‑decade redistricting, but that it does so “by clear implication.” The circuit court, on stipulated facts, rejected that claim and declared HB 1 valid. The Supreme Court of Missouri affirmed.

2. Summary of the Opinion

The Court held that Mo. Const. art. III, § 45 imposes a mandatory duty to redistrict after each decennial census is certified to the governor, but it does not impose an exclusive time window for redistricting. In the Court’s formulation, “‘when’ does not mean ‘only when’.”

Because the Missouri Constitution is treated as a limitation on otherwise plenary legislative authority, the Court required any restriction on mid‑decade redistricting to appear in express constitutional text (or arise by logically necessary implication from that text). It found no such limit and concluded HB 1 does not “clearly contravene” the constitution.

3. Analysis

3.1 Precedents Cited

The opinion is anchored in Missouri’s separation between (a) the General Assembly’s broad legislative power and (b) the constitution’s role as a set of constraints on that power. The Court deploys multiple prior decisions to define the level of clarity required to invalidate a statute and to cabin “implied” constitutional restrictions.

• Standards of review and interpretive method
  • Fletcher v. Young, 689 S.W.3d 161 (Mo. banc 2024): Declaratory judgment review; where facts are stipulated, review turns on correct declaration/application of law.
  • C.S. v. Mo. State Highway Patrol Crim. Just. Info. Serv., 716 S.W.3d 264 (Mo. banc 2025): De novo review for constitutional interpretation; consider the provision “as a whole.”
  • Robust Mo. Dispensary 3, LLC v. St. Louis Cnty., 721 S.W.3d 135 (Mo. banc 2025): “Plain, ordinary, and natural meaning”; when unambiguous, canons are unnecessary.
• Plenary legislative power and strict construction of limits
  • Liberty Oil Co. v. Dir. of Revenue, 813 S.W.2d 296 (Mo. banc 1991): The General Assembly may do what is necessary to perform its functions “except as expressly restrained by the Constitution.”
  • Bd. of Educ. of City of St. Louis v. City of St. Louis, 879 S.W.2d 530 (Mo. banc 1994): Constitutional limitations are “strictly construed in favor of the power of the General Assembly.”
  • City of St. Louis v. State, 682 S.W.3d 387 (Mo. banc 2024): Statutes are invalidated only if they “clearly contravene” the constitution.
• Express enumeration does not imply exclusion absent negative terms
  • Bohrer v. Toberman, 227 S.W.2d 719 (Mo. banc 1950): “An express enumeration of legislative powers … cannot be considered as the exclusion of others not named unless accompanied by negative terms.” The Court uses this to reject the claim that § 45’s timing clause is inherently exclusive.
• Implied limits: “necessary implication,” not policy-driven inference
  • State ex rel. Heimberger v. Bd. of Curators of Univ. of Mo., 188 S.W. 128 (Mo. banc 1916): Limits may arise “either in terms or by necessary implication,” but courts must not invent limits from an unexpressed “spirit” of the constitution; limits must be “clear beyond a reasonable doubt.”
• Cases invoked by the dissent (and rejected as controlling)
  • Ex Parte Arnold, 30 S.W. 768 (Mo. 1895): Cited by the dissent for the proposition that constitutional directions as to “times and modes” carry a presumption of exclusivity; majority treats that “presumption” as insufficient to satisfy the “clearly contravenes” test in this context.
  • State ex inf. Dalton v. Dearing, 263 S.W.2d 381 (Mo. banc 1954): Dissent cites it for the same “times or modes” idea; majority notes the appointment was upheld despite missing a constitutional deadline, undermining any claim that the cited language compels invalidation here.
• Comparison provisions and redistricting bodies of limited authority
  • State ex rel. Teichman v. Carnahan, 357 S.W.3d 601 (Mo. banc 2012): A constitutionally created commission has “limited authority” to what is expressly granted and implicitly necessary; used to rebut Appellants’ analogy to Mo. Const. art. III, § 10’s explicit “may be altered from time to time” language.
• Trigger language: “if” as a prerequisite versus “when” as a duty trigger
  • Pestka v. State, 493 S.W.3d 405 (Mo. banc 2016): Appellants argued it supports exclusivity; the Court distinguished it because art. III, § 32 uses “if” and reflected a clearly limited veto-session mechanism reinforced by multiple amendments. By contrast, § 45 uses “when” and lacks similar limiting amendments.
• Separation of powers cases distinguished as inapposite
  • Conservation Commission v. Bailey, 669 S.W.3d 61 (Mo. banc 2023): Appropriations cannot be used to intrude on executive power; the Court found no comparable separation-of-powers conflict in congressional redistricting.
  • Rebman v. Parson, 576 S.W.3d 605 (Mo. banc 2019): Also separation-of-powers based; similarly distinguished.
  • State v. Hamey, 65 S.W. 946 (Mo. 1901): Trial-by-jury case; cited by Appellants but deemed inapposite because it concerns an explicit individual-right limitation rather than an alleged timing limitation on plenary legislative authority.

3.2 Legal Reasoning

The Court’s reasoning proceeds in a structured sequence:

(a) “First principles”: Missouri’s constitution limits plenary legislative power

Starting from Mo. Const. art. III, § 1, the Court reiterates that Missouri’s constitution operates primarily as a set of constraints, not a grant of enumerated legislative powers. This is the interpretive lens through which § 45 is read:

Therefore, the burden is on challengers to identify a constitutional restraint that the statute “clearly contravenes” (City of St. Louis v. State).

(b) Plain text of § 45: a mandatory floor, not an exclusive ceiling

The operative constitutional text states the General Assembly shall redistrict “[w]hen” each decennial census is certified to the governor. The Court reads this as establishing a minimum frequency—at least once per decade—rather than a prohibition on more frequent redistricting.

The crucial move is the Court’s semantic conclusion: “‘when’ does not mean ‘only when’.” In effect, § 45 is treated as a duty-triggering clause (you must act then), not a negative-terms clause (you may act only then). Because the constitution contains no “shall not” or equivalent negative formulation, the Court refuses to infer exclusivity from timing language alone.

(c) The Court’s approach to “implied” limits: only “necessary implication,” not “presumption”

Appellants (and the dissent) urged that a constitution’s directions as to the time/mode of exercising power carry an implied exclusivity. The majority’s response is methodological: it will not invalidate statutes based on a “presumption” that the constitution intended exclusivity, because the judicial role requires a limit rooted in express text or a logically necessary implication.

Invoking State ex rel. Heimberger v. Bd. of Curators of Univ. of Mo., the Court warns against importing policy preferences through “permissive inferences” masquerading as constitutional limits. The Court also emphasizes the high certainty required to negate legislative power (“clear beyond a reasonable doubt,” as described in Heimberger).

(d) Structural comparisons: why art. III, § 10 doesn’t help Appellants

Appellants argued that art. III, § 10’s clause that state legislative districts “may be altered from time to time as public convenience may require” shows the framers knew how to authorize mid‑decade changes—so the absence of similar language in § 45 implies a prohibition.

The majority flips that inference: § 10 concerns a commission, not the General Assembly, and commissions have only delegated, limited authority (State ex rel. Teichman v. Carnahan). The absence of “altered from time to time” language in § 45 does not restrict the legislature; it reflects that the legislature does not need a special textual permission to act unless the constitution restrains it.

(e) Distinguishing timing-trigger precedents like Pestka v. State

Pestka v. State is treated as a “trigger” case, but not the right kind. There, the constitution used “if” to make a veto session conditional on a prerequisite event. By contrast, § 45 uses “when” to ensure that redistricting occurs after census certification. The Court thus treats “if” as potentially delimiting authority and “when” as setting a mandatory occasion without foreclosing additional occasions absent negative terms.

(f) Rejection of policy/absurdity arguments and out-of-state authority

The Court characterizes claims that mid‑decade redistricting produces “absurd” outcomes as policy disputes with the legislature, not constitutional arguments. It also dismisses out-of-state cases as nonbinding and (because they interpret different constitutional texts) unpersuasive.

3.3 Impact

This decision establishes a clear Missouri constitutional rule on the timing of congressional redistricting:

• Rule: Mo. Const. art. III, § 45 requires congressional redistricting after a decennial census is certified to the governor, but it does not restrict the General Assembly from redistricting more frequently.
• Doctrinal consequence: Challenges to mid‑decade congressional maps in Missouri will face a heightened burden: absent explicit negative constitutional text (or a genuinely unavoidable “necessary implication”), courts will not infer limits from timing provisions alone.
• Institutional consequence: The opinion reinforces a separation between judicial review and redistricting policy. Unless litigants can identify an external constraint (e.g., federal constitutional law, federal statutes, or another Missouri constitutional provision), the court will treat mid‑decade redistricting as a political question committed to legislative discretion.

At the same time, the dissent signals a competing interpretive framework—one in which “when and how” clauses presumptively exclude other times and methods, supported by convention history and treatise authority. That split may shape future litigation strategies: challengers may reframe claims under other Missouri constitutional provisions, or develop records geared to federal law constraints, rather than relying on § 45 timing alone.

4. Complex Concepts Simplified

• Plenary legislative power: In Missouri, the legislature is presumed to have broad power to legislate on any subject unless the Missouri Constitution takes that power away. The federal model is different: Congress has only enumerated powers.
• “Clearly contravenes” standard: Courts do not strike down statutes merely because they seem inconsistent with constitutional “spirit” or good governance. The conflict with the constitution must be clear.
• Express restraint vs. implied restraint: An “express” restraint is stated directly (e.g., “shall not”). An “implied” restraint can exist, but under the majority’s approach it must be unavoidable from the text (“necessary implication”), not merely a plausible inference or historical presumption.
• Trigger language (“when” vs. “if”): The Court treated “when” as identifying a time the legislature must act, but not as a condition that must exist before it may ever act. “If” more naturally functions as a prerequisite condition.
• Declaratory judgment on stipulated facts: Because the parties agreed on the facts, the appeal turned entirely on legal interpretation—what the constitution means—not on fact-finding.

5. Conclusion

The Supreme Court of Missouri affirmed HB 1 and articulated a durable interpretive rule: Mo. Const. art. III, § 45 imposes a decennial redistricting duty triggered by census certification, but it does not, by its use of “when,” forbid additional congressional redistricting within the decade. The opinion reinforces a strong presumption in favor of legislative power in Missouri constitutional review and narrows the role of inference-based arguments where the constitution does not speak in negative, limiting terms.