A public inquiry into the attacks heard killer Valdo Calocane refused toxicology samples in custody.
The walkout over jobs and pay is one of the longest yet in the dispute, and will begin on 7 April in England.
Matt Brittin says he's taking the top job at "a moment of real risk, yet also real opportunity".
The Prince and Princess of Wales joined the congregation at Canterbury Cathedral.
Europol said more than 450 officers from the UK, Germany and Belgium were involved in the operation.