Emergency Alerts; Requiring a local law enforcement agency to activate the emergency alert system and issue a Ya Ya Alert to public and private schools and child care facilities under certain circumstances; requiring local law enforcement agencies to create and maintain a list of such schools and facilities within their jurisdictions; providing immunity from civil liability to certain persons for damages for complying in good faith with specified provisions; requiring the Department of Law Enforcement, in cooperation with specified departments, to activate the emergency alert system and issue an Imminent Threat Alert at the request of a local law enforcement agency under certain circumstances, etc.