MO SB1549

State agencies must base proposed rules on substantial evidence and demonstrate the rule is specifically authorized by statute, prohibiting reliance on general rulemaking authority to expand beyond expressly authorized subject matter

Agencies must adopt procedures to determine rule necessity using reasonably available empirical data, including assessments of rule effectiveness and costs to both the state and affected parties

Proposed rules must be posted on agency websites within one business day of Missouri Register publication, including rule text, fiscal notes, a neutral summary of 100 words or less, and hyperlinks to full text

Creates new Section 536.340 defining "substantive policy statements" as written expressions of agency interpretations regarding constitutions, statutes, regulations, or court judgments, including current practices based on those interpretations

Requires agencies to post all substantive policy statements on publicly accessible websites and maintain complete, current records for public inspection