Establishes an alert system to assist in the location of missing persons with developmental disabilities

Added a new section (301.287) creating 'Mason's Law,' a program allowing residents with communication impairments to flag their license plates for law enforcement access.

Established eligibility for the new program based on a physician or psychologist certification that a person has a condition likely to impair communication for at least five years.

Set a start date of January 1, 2027, for the new license plate designation program, with a five-year expiration and renewal cycle.

Required the Department of Revenue to issue guidance and education materials to law enforcement agencies regarding the new designation system.

Updated the title page and act description to reflect the addition of the new chapter and the expanded purpose of the legislation.

Added a new citation title 'RJ's Law' to the statute, which serves as a formal name for the law but does not alter its legal effect.

Updated the document header to reflect the bill's status as 'Perfected' rather than a draft 'House Committee Substitute', signifying the completion of the legislative process.

Added an emergency clause to allow the bill to take effect immediately upon passage.

Restructured the definition of 'developmental disability' to explicitly exclude Alzheimer's disease and dementia-related disorders for persons aged 60 or older.

Reformatted the bill text from an introduced version to a House Committee Substitute, updating the bill number and removing introductory formatting.