Did the killer pilot of Germanwings flight 9525 put diuretic drugs into his co-pilot's coffee?

 

 

Air crash investigators examining a computer belonging to Germanwings co-pilot Andreas Lubitz are trying to determine whether the killer 'spiked' his captain's drink to force him into the toilet. 

Lubitz, 27, crashed the Airbus A320 passenger jet into the Alps changing the aircraft's altitude to just 100 feet using the autopilot, sending it on collision course. 

German prosecutors believe that Lubitz may have added a chemical to Captain Patrick Sodenheimer's coffee to remove him from the flight deck. 

Once Captain Sodenheimer closed the cockpit door, Lubitz enabled special security features preventing the reinforced door from reopening. 

This special safety systems on the door were introduced following the 9/11 attacks.  During the design, it is said the designers did not consider a rogue pilot seeking to kill himself while taking his passengers and fellow crew with him. 

Already it has emerged that Lubitz used his computer to research methods of killing himself as well as information concerning the cockpit door locking mechanism.  

Following the crash, it emerged that Lubtiz suffered from crippling depression although Lufthansa, who own Germanwings, did not pass on this information to aviation regulators.  

Investigators believe that Lubitz, 27, informed its flight school when he returned from a several-month break in pilot training in 2009 that he had experienced an episode of 'severe depression'. Lufthansa has said he subsequently passed all medical tests.