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If you have physical access, then you have total access.
Not if the storage is encrypted. That's why vulnerabilities in operating systems/kernel are so impactful, as they can bypass that encryption.
It's a bit more nuanced even.
If you have one-time physical access, then you have total access, permitting the storage is not encrypted.
If you have recurring, undetected physical access, then you have total access.
Ex: Dropping a script into someone's unencrypted /boot partition that captures the decryption credential, then coming back later to collect the credential and maybe also remove the evidence.
Well no, if the device is powered off you need to brute force the encryption which will take a very long time.
However, if the device is booted you can just read from ram.