It does happen by mistake. My apartment was raided by police and I know four others who have been raided too. In two of those cases, the people who were raided had nothing to do with any kind of illegal activity. The other three were drug related, of course.

That sucks, sure. Did they actually ask you to unlock your phone?

I've never owned a smart phone. At the time I would've had some prepaid flip phone, and fortunately I was pretty consistent about keeping those out of the house.

Every time I go through customs

Uh, ok... what countries are involved?

Also, how does that work? Customs officer asks you to touch-unlock your phone.

You say, no I have a pin code!

And then they say, oooh then, nevermind, please proceed?

That does not make sense.