Is Endomorphin-1 Legal in Idaho? (2026)

Rule type

permanent

Tier

unscheduled

What the record says

Endomorphin-1 (Tyr-Pro-Trp-Phe-NH2) is not named or scheduled in Idaho. The state has no chemical analogue statute; only an imitation / counterfeit / misrepresentation offense that turns on appearance or representation, not on a substance's intrinsic structure or effect. Controlling instrument reviewed: None general - simulated CS only (Idaho Code 37-2701(ff)). Conclusion: no operative instrument reaches a structurally-dissimilar endogenous opioid peptide; status LEGAL at the state controlled-substances level. Residual risk: minimal. Federal floor still applies (Analogue Act human-consumption contingency + FD&C unapproved-new-drug).

Controlling language, verbatim

Idaho Code 37-2701(ff): "'Simulated controlled substance' means a substance that is not a controlled substance, but which by appearance or representation would lead a reasonable person to believe that the substance is a controlled substance. Appearance includes ... color, shape, size, and markings of the dosage unit ..." No chemical analogue statute. [Appearance/representation only.]

Source of excerpt

Citations

1. None general - simulated CS only (Idaho Code 37-2701(ff)) (Code mirror) PRIMARYOFFICIAL
2. Idaho Code 37-2701(w) (opiate def) (Code mirror)OFFICIAL

Where Endomorphin-1 stands across the country

Among Idaho's 6 neighbors, Montana, Nevada, Oregon, Utah, Washington and Wyoming are legal, the same posture as Idaho.

Open the interactive map · Every compound in Idaho

Federal posture

Not federally scheduled. Endomorphin-1 - not federally scheduled; endogenous opioid tetrapeptide, no CSA entry and no analogue-act structural hook Federal detail

Verbatim law on file for Idaho

1 instrument on file for this compound's framework in Idaho; 2 of 2 citations above are official sources. Each text carries its source and a fingerprint that changes when the law does.

**Schedule gap — § 37-2705(d):** "Hallucinogenic substances. Any material, compound, mixture or preparation that contains any quantity of the following hallucinogenic substances, their salts, isomers and salts of isomers … (for purposes of this subsection only, the term 'isomer' includes the optical, position and geometric isomers) … (12) Alpha-ethyltryptamine; (13) Alpha-methyltryptamine; (14) Bufotenine; (15) Diethyltryptamine (DET); (16) Dimethyltryptamine (DMT); … (27) Psilocybin; (28) Psilocyn." (4-HO-MET not named; isomer-only.)
— Idaho Code § 37-2705(d); via labeled Justia mirror (2025): https://law.justia.com/codes/idaho/title-37/chapter-27/article-ii/section-37-2705/
**No chemical analog — § 37-2701(ff):** "'Simulated controlled substance' means a substance that is not a controlled substance, but which by appearance or representation would lead a reasonable person to believe that the substance is a controlled substance." (Appearance-based imitation, not a "substantially similar chemical structure" analog act. No analog provision exists in § 37-2701.)
— Idaho Code § 37-2701(ff); via labeled Justia mirror (2025): https://law.justia.com/codes/idaho/title-37/chapter-27/article-i/section-37-2701/

Related

Endomorphin-1 in neighboring states

• Endomorphin-1 in Montana Legal
• Endomorphin-1 in Nevada Legal
• Endomorphin-1 in Oregon Legal
• Endomorphin-1 in Utah Legal
• Endomorphin-1 in Washington Legal
• Endomorphin-1 in Wyoming Legal

Endomorphin-1 in other states

Same framework in Idaho

• 4-HO-MET (Metocin) in Idaho Legal
• 5-MAPB in Idaho Legal
• Blue Lotus (Nymphaea caerulea) in Idaho Legal
• Amanita muscaria / Muscimol in Idaho Legal

Other compounds in Idaho

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