Proposition 65

Answers whether a chemical is on California's Proposition 65 list, the list of substances requiring a consumer warning in California. Data is the OEHHA list published under Title 27 CCR section 27001, 31-Jul-26 edition, embedded in the server. Call these tools instead of recalling the list from memory. It carries about a thousand entries, is revised at least yearly, and a wrong answer is expensive in both directions: a missed listing is a missing warning and a private-enforcement notice, while a spurious one is a warning that should not be there. **A `not_found` result is not a clearance.** Prop 65 turns on exposure rather than presence, chemicals appear under names and group listings that an exact match will miss, and the list changes. Every answer carries a `notCovered` array saying what it does not establish; pass that on rather than reporting a bare yes or no. **Delisted chemicals are reported, not hidden.** Twenty-seven entries were listed and later removed. They return `listed