Detective Sergeant Peter Flook, who assisted Mr Weeden, did not even know his own job description.
Mr Roberts was a detective sergeant with Merseyside Police in 1993 when he arrested Thompson.
Detective Sergeant Roger Smith led the Dyfed Powys Police investigation into the death.
The Smithwick Tribunal has been told of "rumours" in the mid-1980s that a Garda detective sergeant had inappropriate associations with subversives.
Detective Sergeant Steve Bull of Victoria Police said she had left the bar and had intended to walk home a short distance away.
Members of the victims' families declined to speak outside the court, and Detective Sergeant Steve Martin read a statement on behalf of all the families.
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The actor - who played Detective Sergeant George Carter in the ITV series - is to appear in pilot comedy drama New Tricks, alongside James Bolam and Alun Armstrong.
The star informer was Trevor Haken, a former detective sergeant who helped to install miniature video cameras in the dashboard of a police car and in the light fittings of a prostitute's home.
Mr Roberts joined the Isle of Man constabulary in 1984 and worked as a constable in Douglas, Onchan and the CID before being promoted to detective sergeant in the Fraud Squad in 1996.
The unexplained meetings of Detective Sergeant David Coles and Clifford Norris, father of suspect David Norris, raised "much suspicion" and it is inexplicable that until the summer of 1994 no attempt was made to prevent the "evil influence" of Norris by arresting him.
"We believe at least 10 or more people have witnessed some of the events, " Detective Senior Sergeant Brian Archer said on Thursday.
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"Unfortunately Mr Ryder has no recollection of what took place or the events leading up to the incident, " Detective Senior Sergeant Brian Archer said.
"It appears that Jesse has been the victim of a serious assault and suffered head injuries as a result, " Detective Senior Sergeant Brian Archer told a nationally televised news conference.
They were Detective Carlos Rangel and Sergeant Manny Madrid.
One of them, Aurora police Detective Alton Reed, took the stand again Wednesday and said he spoke only to an Aurora police sergeant about what he saw in the notebook.
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