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+# Research pass: Mexico 1891 sanitary-code article and entry upgrade
+
+Research checked on 26 October 2026. Mexico's 1891 first restriction (pop
+132M) gains a properly sourced article built from the Schievenini chapter
+read in full in the local EPUB, and the entry gets per-sentence citations
+plus the dose detail. No scores, profiles or timelines changed.
+
+## What was verified (all sources actually read)
+
+- José Domingo Schievenini, "A Historical Approach to the
+ Criminalization of Marijuana Use in Mexico" (ch. 6 of Cannabis: Global
+ Histories, local EPUB chapter_6.xhtml): the 1891/1894/1902 sanitary-code
+ regime in full — state-medical alliance, pharmacy stock lists (caffeine,
+ cocaine, codeine, morphine, hemp seeds, cannabis products), the
+ gatherers-only-to-pharmacists rule, prescription-only dispensing, exact
+ doses (2g haschich/tincture, 0.5g extract, 1/3g cannabinone);
+ Guanajuato 1871 precursor; Zacatecas 1904, Nuevo León 1905, Mexico City
+ 1909 tightenings; Porfiriato context; 1920 decree dropping marijuana
+ from the medicines list (possession fines, 15-day jail); 1926 code
+ "enervating drugs" list with marihuana, La Castañeda confinement,
+ 1929/1931 penal codes and the antidrug police.
+- New `articles/mexico-sanitary-code-1891.md` (368 words, 4 sections,
+ single academic source cited throughout; links to the 1920-ban article
+ and /country/mx/). Entry `mexico-sanitary-code-1891` keeps its text and
+ scores, gains per-sentence citations, the dose sentence and a precise
+ locator.
+
+Claim boundaries: the article stays inside the chapter's account — no
+independent verification of the codes' texts (not readable online), no
+claims about the 1891 code's penalties beyond what the chapter states
+(prescription/pharmacy control, not criminal possession).
+
+## Dead ends recorded, not forced
+
+- The 1891/1894/1902 code texts themselves are not readable online; the
+ chapter is the cited evidence. Jamaica 1924 needs nothing (already
+ sourced to Rubin & Comitas plus Banks). Morocco 1888 still rests on a
+ single Duvall page — too thin for an article.
+
+## Verification and files
+
+- `node -e` YAML load of changes.yaml clean (run before build).
+- `npm run build`, `npm run history:test`, `npm run answers:test` all green;
+ rendered `/history/mexico-sanitary-code-1891/` citation marks checked.
+- Commit limited to own work: the 1891 hunk in changes.yaml, the new
+ article, this note, via pathspec. Foreign staged/worktree files excluded
+ and preserved.