Back in the lab, Speedle is still playing back the recovered phone message with the same wide-eyed obsessiveness Kennedy assassination conspiracy buffs show when doing a frame-by-frame analysis of the Zapruder film. He's discovered a mysterious clicking noise on the audio track, which occurs sometime after the mysterious Ace appears on the tape. Before Speedle can descend further into madness, the spunky lab tech who recently returned from a hitch in Quantico strolls up. "Speed, you all right?" she asks, since the printouts of the audio analysis he's running are now piling up all over the floor. Speedle hurries off to where a dot-matrix printer is busy outputting reams and reams of data. Speedle looks at one of the sheets and says to no one in particular, "Reservatrol?" Before we can figure out what exactly an antioxidant found in grapes has to do with an audio analysis -- and Jesus, could the science scenes on this show be any less illuminating? -- we're back to the Good Ship Breck, where Horatio and his acolytes are finding all sorts of evidentiary goodness. Based on carpet impressions, Horatio's able to figure out that someone placed a chair right in front of the bed -- all the better to photograph the Brecks in the act of human love. Now, this is the kind of FlashbackCam I can get behind! Horatio suggests that "we" -- or more accurately, Calleigh -- process the floor between the chair and the bed, paying particular attention for biologicals. Because apparently a roll of film isn't the only thing the photographer shot. As Calleigh girds herself for the always life-affirming task of searching for human ejaculate, Delko finds a knife behind a panel on the boat. "That's an Echelon MPT," Calleigh chirps. "I've only seen those at gun shows." Ladies and gentlemen, we have a murder weapon.