The Electoral Commission will publish its advice on Scotland's independence referendum later.
They are expected to shorten the SNP's preferred question for voters;
'Do you agree that Scotland should be an independent country? '
The commission will also announce plans for campaign spending limits.
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Sandy Murray, of Police Scotland, was was giving evidence at the trial of a bus driver who denies killing Ryan Baird by dangerous driving.
34-year-old Christopher Peck was involved in a head-on crash with a drunk driver. His funeral has taken place in his hometown, Workington.
The arrests come weeks after a much-publicised series of appeals to mark the 30th anniversary of the 18-year-old's death.