CCTV images don't always have to show the actual incident to be of use in an investigation. They can often show that a suspect or witness was or wasn't where they say they were. It can also show the movements of a persons vehicle as reported by the BBC in this article.
Man 'went shopping with mistress' after wife's murder
BBC News
Motorway CCTV images also supported the allegation he left after his wife's death, the court was told. Mr Palmer's mistress, Jackie Marshall, ...
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