An at risk adult male (due to an injury) was separated for his care giver and possibly boarded a San Francisco bound train at the Orinda Station. BART Central made system wide notifications and pages in an attempt to locate the male. Dispatch sent out a Bay Area wide teletype bulletin to advise outside agencies. A detective sent out a Missing At Risk Adult to all Bay Area outside agencies. BART Central will continue making system wide notifications system wide until the end of revenue. All notifications have been made.