MS HB664

Establishes the Mississippi Silver Alert System, a tiered rapid response notification system for missing adults age 18 or older with dementia or other cognitive impairments.

Requires the Bureau of Investigation of the Department of Public Safety to implement the system and authorizes only law enforcement agencies to request Silver Alert activation through the Mississippi Highway Patrol Headquarters Communication Center.

Specifies four mandatory criteria for activation: missing person has dementia or cognitive impairment, is believed to be in imminent danger, has an filed missing person's report with waiting periods waived, and the case is reported to the Bureau of Investigation.

Directs local law enforcement to notify the Highway Patrol, enter information into the National Crime Information Center (NCIC), activate alert bulletins to agencies and media, activate emergency broadcast systems, and provide a 24-hour phone number for tips.

Provides for alternate mass notification via email for cases not meeting Silver Alert criteria, and allows the Department of Public Safety to reconsider activation if new evidence emerges; effective July 1, 2010.