Yet another 'hub' vs 'mid-drive' discussion, I know but I just came across this and I found it surprising that they opted for mid drives.
I've never paid attention whether or not police also have e-bikes in the UK, or any other country so this was news to me as well.
Most city rental e-bikes I am aware of have hub motors as we all know - so seeing a fleet of e-bikes with mid drives bewildered me a little bit.