You would have to ask medical professionals about whether a glass of wine or two has any affect on cognitive and motor skills or affects memory recall. You can read the statements of all 4 people present at the confrontation and work out which ones were drinking tea or coffee or whatever that night
Volume VIII, pages 1959-1964 (6 pages)
WITNESS STATEMENT (3 of 3) OF ARGUIDO: ROBERT MURAT
Date: 2007/07/11; Time: 10:00; Location: DIC Portim�o
Officer: Paulo F., Inspector.
*snipped*
---- At 14:30 the present interview was restarted.
---- Questioned the defendant reaffirms that in truth on the afternoon of 03 May he arrived at Casa Liliana around 19:00/19:30 having left the VW stopped in front of the house, that is outside the property, immediately entering into the property. Questioned he does not remember the clothes he was wearing at the time. Nor does he remember if his mother was at home or not. Nor does he recall in detail what he did. He remembers that at one time he spoke with his mother, however he cannot recall whether she arrived meanwhile or she was already there. He remembers that they were sitting in the kitchen and the defendant remembering that he ate, how long with his mother he does not remember. Confronted with the testimony of his mother who told that she arrived at the house around 20.30 and that Robert had also arrived at that moment, he says that he cannot account
for having arrived at the same time as his mother.
---- Questioned he says that when he heard the sound of a siren he was with his mother in the kitchen, still talking, it would be about 22:00/22:30, the time he estimates taking into account that they had the television on. Questioned he said not to recall if the sound was continuous or discontinuous. He remembers only that at that time there was the sound of voices from both their talk and the sound of television, not recalling other sounds in the background. He remembers well having heard that sound given that after it he commented to his mother that it seemed that he was in her house in England given that there he assiduously heard the sound of sirens. He was not aware of other noises namely raised voices or the dogs barking outside the property.
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Almost as vague as "I know nothing, Mr Fawlty".