What our memos
were generated against.

Every Avow screening memo footer carries a corpus version and a SHA-256 hash of the citation whitelist that was active at the moment of generation. This page is the public resolution for that footer. It tells you, and any reviewing agency, exactly which authorities were in scope.

Ledger snapshots: verify any past memo

Every memo footer carries the corpus version and the first 12 hex characters of the SHA-256 hash of the active citation whitelist. Each row below is a downloadable JSON snapshot of the whitelist (and any rescinded citations) at the moment that version went live. Match the version on your memo footer to the row below, open the JSON, and verify the whitelist contents directly. No email round-trip required.

Each ledger JSON contains the full sorted whitelist, the rescinded-citations set, the full SHA-256 hash, the effective date, and a pointer to the changelog section narrating that version's changes. Schema version 1.

Sources we monitor

The Regulatory Monitor at /monitor surfaces the current Federal Register feed for these agencies. The structured list below is the corpus's bibliographic ground truth. These are the source families the citation whitelist is built from.

Version log

v2026.05.2: ACHP NEPA-procedures rescission (2026-06-12)

What changed: The Advisory Council on Historic Preservation rescinded its NEPA-implementing procedures at 36 C.F.R. Part 805 by interim final rule, 91 FR 34159 (June 5, 2026; effective on publication; comments due July 6, 2026) [Doc. No. 2026-11298]. The corpus now records the action in its agency-rescission ripple, and 36 C.F.R. Part 805 is tagged as rescinded authority.

What did not change: ACHP's Section 106 regulations at 36 C.F.R. Part 800 are unaffected and remain controlling. Section 106 screening content is unchanged.

Whitelist: no in-force additions or removals. Part 805 was never on the whitelist; tagging it rescinded is defense-in-depth so the citation validator rejects any prospective use. Counts: 148 in force, 11 rescinded.

Audit trail: verified against the Federal Register's published document record on 2026-06-12 before integration. Non-material items reviewed and dismissed in the same pass (DOI ELIPS and EPA NEPA program page changes: both inspected, no procedural content) are preserved in Avow's internal corpus changelog.

v2026.05.1: CEQ rescission correction (2026-05-21)

What changed: Corrected the framing of the January 8, 2026 CEQ action. The corpus had described it as a "Final Rule." It is, in fact, the finalization of the rescission of 40 C.F.R. §§ 1500–1508 (the NEPA implementing regulations), driven by the Marin Audubon decision and Executive Order 14154 chain. NEPA itself (42 U.S.C. § 4321 et seq., as amended by FRA 2023) remains in force; agency-specific NEPA procedures (e.g., DOT, USACE, DOI) also remain in force.

Whitelist retirements: 40 C.F.R. §§ 1500–1508 retired from the in-force section as of 2026-01-08. Any prospective citation to those sections in a memo issued on or after that date is now rejected by Avow's citation validator as [CITATION RESCINDED — REVIEW REQUIRED].

Corpus document renamed: "CEQ Final Rule (Jan 2026)" → "CEQ Rescission (Jan 2026)" to match the corrected framing.

Audit trail: the corrected framing was fact-checked against the Federal Register notice plus six independent counsel commentaries before publication. The full correction record is preserved in Avow's internal corpus changelog.

v2026.05: Launch baseline (2026-05-20)

What changed: Initial production corpus. Anchored on NEPA itself (42 U.S.C. § 4321 et seq., as amended by the Fiscal Responsibility Act 2023 at §§ 4336 / 4336a / 4336b / 4370h), agency-specific NEPA procedures still in force, the post-Sackett WOTUS framework (598 U.S. 651, 2023), and the post-Loper Bright administrative-law landscape (603 U.S. 369, 2024; 603 U.S. 799, 2024). 40 C.F.R. §§ 1500–1508 were originally included in the launch baseline but are now retired. See v2026.05.1 above.

Whitelist additions: 28 authorities including 7 C.F.R. pt. 1b (USDA consolidated NEPA, April 2026), 40 C.F.R. § 230 (EPA § 404(b)(1) guidelines), 40 C.F.R. § 122 (NPDES), 40 C.F.R. §§ 51 / 93 (General Conformity), 33 C.F.R. § 222 (USACE dam safety), 36 C.F.R. pt. 79 (curation), 36 C.F.R. pt. 296 (ARPA), 54 U.S.C. § 300101 (NHPA recodification), 16 U.S.C. §§ 1801 / 1802 / 1855 (Magnuson-Stevens / EFH), 33 U.S.C. §§ 1341 / 1342 (CWA § 401 / § 402), EO 14008, EO 14096, Loper Bright Enterprises v. Raimondo, Corner Post v. Bd. of Governors, Seven County Infrastructure v. Eagle County, Sackett v. EPA, plus the AB 52 Tribal Cultural Resource framework for the CEQA pack.

Whitelist retirements: none (launch baseline).

Corpus files added this version:

• ceq_rescission_jan2026.md: NEPA, Jan-2026 CEQ rescission of 40 C.F.R. §§ 1500–1508
• usace_rgl_post_sackett.md: CWA § 404, post-Sackett implementation
• usfws_s7_handbook_excerpts.md: ESA § 7 consultation
• nepa_ce_catalog_2026.md: NEPA Categorical Exclusion catalog
• nhpa_section_106.md: NHPA § 106 (36 C.F.R. pt. 800)
• ceqa_appendix_g.md: CEQA Appendix G + AB 52
• msa_efh_consultation.md: Magnuson-Stevens EFH consultation
• cwa_npdes_stormwater.md: CWA NPDES § 122 (CGP / MSGP / MS4)
• district_quirks.json: USACE district-level implementation notes (structured)
• citation_canon.md: Bluebook canonical form for every whitelist entry

How to verify a memo

1. Open the PDF footer of any Avow screening memo.
2. Locate the corpus version string and the 12-character whitelist SHA.
3. Find that version in the "Ledger snapshots" table above and confirm the published SHA prefix matches the value on the memo.
4. Click the JSON link to download the full ledger. The whitelist array is the complete sorted citation set; the whitelist_hash_sha256 field is the full SHA-256 you can independently recompute from SHA256("\n".join(sorted(whitelist)).encode("utf-8")).
5. The rescinded_citations array lists any authorities retired in that version. Any citation appearing on a memo footer that is also in the rescinded set for that version is flagged for review.
6. For questions about a specific memo or order ID, contact [email protected].

What this page is not

• Not the full corpus text. The proprietary regulatory commentary, district quirks JSON, and full Bluebook canon are licensed to customers and partners, not republished here.
• Not a substitute for reading the underlying authorities. Every authority on the whitelist is publicly available at the issuing agency. The whitelist is our bibliography; the agencies are the source of truth.
• Not legal advice. See Terms of Service.