ANNAPOLIS - Friends last saw Robert Stewart last Thursday in Annapolis.
Rescue teams and Department of Natural Resources workers spent Wednesday morning searching nearby waters for him.
"We've been using side scan sonar to look in the waters around the city dock," one police official said.
"All scans so far have been negative."
Stewart works at Mills Fine Wine and Spirits down at the city dock in Annapolis.
Annapolis police don't have any hard evidence Stewart is in the water, they just are checking all the possibilities. Police have not found any reasons for Stewart to suddenly go missing. Police have been monitoring his cell phone and his bank card for activity.