One aspect I wasn't taking into consideration is the situation the OP was asking about. If it's something like you get pulled over by a cop driving down the street and If the cop takes your phone away from you (he/she has to have just cause or a warrant), it's not a matter where they can crack your phone in a few minutes while sitting in their car. If you were to get taken into custody however, than yeah they can crack into your phone eventually. But it's not like they do this for everyone. It's going to take them time and resources so cracking into someone's phone is only done when they suspect there's relevant information on the phone. Of course that's such a loosely defined issue that it's probably done more often than it actually needs to be but it's still not as simple as just plugging a phone into a magic box and pushing a button.
Yes.
And that 'time and resources' thing is everything.
You would be surprised what those are not spent on sometimes.
WARNING! TRUE STORY WITH POSSIBLY SENSITIVE CONTENT AHEAD
A friend had a neighbor with nefarious contacts.
This neighbor had small children.
My friend awakens to cos pounding on his door, telling him and his wife that the immediate neighborhood is being evacuated.
He and his wife join his other neighbors out in the road.
As it turns out, someone had placed multiple IEDs all around his neighbor's yard, one of which was about 12 foot from the wall that my friend's headboard was against.
The neighbor was awakened by the sound of breaking glass, as whoever had boobytrapped his yard had then thrown a Molitov cocktail made from a glass jar full of flammable liquid through the kitchen window.
Luckily, the fire went out when the jar went through the window, so no fire erupted in the house.
But, believe it or not, the cops had absolutely no interest in getting any fingerprints off of the broken jar pieces, or even collecting them.
There were obvious prints on the glass.
When asked about it, the reply from the cops was "You have been watching too many police shows on TV."
You would think that as this attack had put my friend and his wife, along with other neighbors, the person targeted, and his small children all at risk that they might have spent some time and resources to lift a few prints from a firebomb used in the attack.
You would have thought wrong, I guess.
And yes, the IEDs around the yard were real, the bombsquad was brought in and the devices were detonated under containment out in the street.
So yeah, no prints available there, either.
Oh well, I guess that's case closed, then.