I read in this article that a non-encrypted tablet with only screen-lock on can have data read through USB.
Is this really true for example for a Nexus 7 tablet? I mean - if I lock the screen you can't get anywhere, even if you restart the device. Attempts to root it, or to hack it somehow when the bootloader is locked forces a data wipe and a factory reset. So is it really possible to get to the data in a screen-locked Nexus 7 which has no SD card?
The only way I can think about is that someone would somehow open the device and take the internal memory out and connected it somehow to a device which could read it. I presume that would be pretty expensive. If this really is the only way how to get to the data, it might be interesting to know, how much it may cost to do such a thing. If it is really costly, than it should be okay to just use screenlock.