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Don’t ever hand your phone to the cops
(www.theverge.com)
This is a most excellent place for technology news and articles.
I think some of the concern is when cops will use force illegally and then lie about it, so they wouldn't necessarily have access to forensics.
Like taking your phone and go through your WhatsApp messages?
If that's a concern you could set up a password to access any sensible app or chat within that app.
I think that is a more sensible approach. As if you are targeted by any reason an undercover cop could get a hold on your unlocked phone by many different ways.
Seems like a good use for android app pinning, I think that locks the phone to that app until unlocked