To overturn such an impression would require overwhelming and incontrovertible evidence, not vague recriminations from a few former employees.

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You see, the secret, I felt - and I have always felt, as an advocate - is to find a memorable but simple phrase that will stay in a jury's mind, that they won't forget easily, and that sums up for them graphically exactly the impression one hopes they're getting about that man from the evidence.

BBC: News Online

To paraphrase the old saying, a facial impression is worth 1000 words (and it also has the convenient feature of not being persuasive evidence in court).

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My impression is that the Commission is, quite strategically, seeking to underpin its conclusions with verbal evidence, so that they will be very difficult for a sceptical government to ignore.

BBC: Week ahead in committees