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> but they should never be able to compel me to open the door for them.

If they have a warrant and don’t open the door, they will break it down with a sledge hammer.

And they are welcome to do so, so long as I am made whole at the end of the investigation if no evidence is found.

Use the sledgehammer on the phone then. I'm sure shattered glass and bits of silicon will give them all the evidence they need.