Modifies the standard of review for agency interpretation of statutes, rules, regulations, and subregulatory documents

HB 663 modifies Missouri's judicial review process for agency decisions by requiring courts to interpret statutes, rules, regulations, and subregulatory documents **de novo** (without deferring to agency interpretations). It directly affects courts, state agencies, and individuals or entities challenging agency actions. The key provision mandates that courts independently interpret legal texts rather than relying on agency explanations, with courts resolving ambiguities by favoring interpretations that limit agency power and protect individual liberty. This change applies to all administrative cases under sections 536.100-536.140, altering the standard of review for agency determinations.