For me personally, the problem is with trust. I'm not confident that these devices won't encourage the agencies that have them to "go fishing" on the phones of every person they arrest just because they have these shiny new toys.

I also don't trust these agencies will be held accountable when they abuse these devices.

Sally Suburb has a warrant for unpaid tickets? Better check her phone while we have her!

I recall a certain incident, which I'm sure wasn't isolated. I believe it was in California somewhere, where police essentially saw obtaining and trading nudes they would obtain from peoples' phones as a game.

Using the threat of force to obtain nude images of women you've pulled over sure has a rapey feel, to me. Going on and forwarding those images to your friends sounds an awful lot like revenge porn as well. Apparently the police in that area don't agree, though.

I don't believe any of those officers received any actual punishment beyond the standard "take a paid vacation while we let this blow over in the media".

I know, I know, it was just a few of those mythical and rare "bad apples".. but until the good apples who supposedly outnumber the bad start cleaning house, and stop standing up for those "bad apples" to protect the image of their "brotherhood", trust will continue to be an issue.