As of October 7, 2026, 5-MAPB is in a legal gray area (sold in practice, exposed to an interpretive ban theory) in Washington. Gray (analog-exposed): treated as Schedule I via controlled substance analog act. Controlling source: RCW 69.50.214 - Controlled substance analog (treated as Schedule I).
Verified October 7, 2026 (manual) · confidence: confirmedMechanism: OPERATIVE ANALOG ACT. Basis: INTERPRETIVE. 5-MAPB is not named and not class-captured - RCW 69.50.204(c)/(d) Schedule I names MDMA and MDA and benzene-ring methylenedioxy/dimethoxy phenethylamines only, with no benzofuran entry and no substituted-phenethylamine structural class (benzofuran-ring TRAP holds). Reach runs through Washington's controlled-substance-analog scheme, which is fully operative: RCW 69.50.101(16)(a) defines an analog by substantially-similar structure PLUS substantially-similar CNS effect to a Schedule I/II substance, and RCW 69.50.214 expressly provides that 'a controlled substance analog, to the extent intended for human consumption, shall be treated ... as a substance included in Schedule I', deployed by the RCW 69.50.401 offense. Anchors: MDMA/MDA (both WA Schedule I; 5-MAPB is the benzofuran bioisostere/entactogen analog). Because the product is a consumer ingestible, the 'intended for human consumption' trigger of Sec. 69.50.214 is met. LOOSE ZONE: capture is a fact-specific analog determination (structural + pharmacological substantial-similarity to MDMA/MDA), not a facial per-se ban; ring difference is contestable but the entactogen pharmacology anchor is strong. Correction vs seed: seed cited only the RCW 69.50.401 offense; the operative deeming provision is RCW 69.50.214 (analog treated as Schedule I) - added and quoted verbatim from official app.leg.wa.gov.
A controlled substance analog, to the extent intended for human consumption, shall be treated, for the purposes of this chapter, as a substance included in Schedule I
Among Washington's 2 neighbors, Idaho and Oregon are legal.
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Federal gray area. Unscheduled by name; Schedule I by Federal Analogue Act when intended for human consumption Federal detail
2 instruments on file for this compound's framework in Washington; 5 of 5 citations above are official sources. Each text carries its source and a fingerprint that changes when the law does.
f2016f99bbc64a47**RCW 69.50.204(c) (hallucinogen chapeau + isomer definition)** — "Hallucinogenic substances. Unless specifically excepted or unless listed in another schedule, any material, compound, mixture, or preparation which contains any quantity of the following hallucinogenic substances, including their salts, isomers, and salts of isomers whenever the existence of those salts, isomers, and salts of isomers is possible within the specific chemical designation. For the purposes of this subsection only, the term 'isomer' includes the optical, position, and geometric isomers" — RCW 69.50.204(c), https://app.leg.wa.gov/RCW/default.aspx?cite=69.50.204&pdf=true (OFFICIAL — certified 7/12/2024). Psilocyn and psilocybin are listed; 4-HO-MET is not. **RCW 69.50.101(16) (controlled substance analog)** — "'Controlled substance analog' means a substance the chemical structure of which is substantially similar to the chemical structure of a controlled substance in Schedule I or II and: (i) that has a stimulant, depressant, or hallucinogenic effect on the central nervous system substantially similar to the stimulant, depressant, or hallucinogenic effect on the central nervous system of a controlled substance included in Schedule I or II; or (ii) with respect to a particular individual, that the individual represents or intends to have a stimulant, depressant, or hallucinogenic effect on the central nervous system substantially similar to [that] of a controlled substance included in Schedule I or II." — RCW 69.50.101(16), https://app.leg.wa.gov/RCW/default.aspx?cite=69.50.101&pdf=true (OFFICIAL — certified 8/15/2025).
b89d8e66c22f4597RCW 69.50.214. Controlled substance analog. A controlled substance analog, to the extent intended for human consumption, shall be treated, for the purposes of this chapter, as a substance included in Schedule I. Within thirty days after the initiation of prosecution with respect to a controlled substance analog by indictment or information, the prosecuting attorney shall notify the commission of information relevant to emergency scheduling as provided for in RCW 69.50.201(e). After final determination that the controlled substance analog should not be scheduled, no prosecution relating to that substance as a controlled substance analog may continue or take place. RCW 69.50.101(16)(a). "Controlled substance analog" means a substance the chemical structure of which is substantially similar to the chemical structure of a controlled substance in Schedule I or II and: (i) that has a stimulant, depressant, or hallucinogenic effect on the central nervous system substantially similar to the stimulant, depressant, or hallucinogenic effect on the central nervous system of a controlled substance included in Schedule I or II; or (ii) with respect to a particular individual, that the individual represents or intends to have a stimulant, depressant, or hallucinogenic effect on the central nervous system substantially similar to the stimulant, depressant, or hallucinogenic effect on the central nervous system of a controlled substance included in Schedule I or II.
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