This is categorically false and borders on misinformation.
Subpeonas etc. can be challenged by US companies/individuals in the court when they are within the country. Innocent until proven guilty is the way of life within a country. During border crossing, system has been changed to assume guilty until proven innocent (for better or worse).
You are correct that if you are in such a situation (border agent asking for data), it's better to comply amicably. I personally would consider cloud backing data and cleaning up local drive before entering US as my best strategy. Carrying unsurmountable amount of data (10 TB+) is also another strategy.
Subpeonas etc. can be challenged by US companies/individuals in the court when they are within the country. Innocent until proven guilty is the way of life within a country. During border crossing, system has been changed to assume guilty until proven innocent (for better or worse).
You are correct that if you are in such a situation (border agent asking for data), it's better to comply amicably. I personally would consider cloud backing data and cleaning up local drive before entering US as my best strategy. Carrying unsurmountable amount of data (10 TB+) is also another strategy.