And here’s where we introduce you to this magical term called full disk encryption!
This person should also turn off their computer and remove the RAM so it’s zeroed out if it gets siezed.
Full disk encryption doesn’t help much if the pc is running anyway since the key will be in memory
How will they carry the running pc if it’s not a laptop?
They use forensic tools to clone the RAM before moving it. Probably depends on exploits so whether it will work may depend on your OS, but they have access to the hardware so there are a lot of possibilities.
Is this actually practically achievable or mostly theoretical in a lab? Is it confirmed that the cops have actually managed to do this?