Add Ecuador 1970 drug law: users to hospital, growers targeted

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+# Ecuador 1970 drug law (new entry)
+
+- New `ecuador-drug-law-1970` (other, 1970, checked): first drug law —
+  Ley de Control y Fiscalización del Tráfico de Estupefacientes, 1970
+  (reforms 1972/1974, DS 909). Public-health orientation: users found under
+  the influence to hospital, dependency assessment, detention in medical
+  facility through rehabilitation. Enforcement: growing plants for
+  processing + precursor chemicals highest; pharmacies supervised; little
+  attention to informal trafficking.
+- Source read: Sandra G. Edwards, "A Short History of Ecuador's Drug
+  Legislation and the Impact on its Prison Population" (Systems Overload,
+  full PDF: evolution section + footnote law citations Titulo 11 Arts
+  24-28, DS 909 Sept 1974). Contrast noted: 1987 law starts harsh
+  penalties (12-16 years), 1991 Law 108 fully punitive.
+- Estimate retained (window pre-1950; 1970 outside it). Chain ec 0
+  flagged.