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Personal data has the right to be secure against unreasonable searches, seizures or examination, and it shall not be violated. No warrants shall be issued for access to it except upon probable cause, supported by oath or affirmation, and particularly describing the data to be accessed and searched, and the data to be seized or examined.

The Right To Oppose Unreasonable Search or Seizure

This is the fourth amendment to the US Constitution (and part of the Bill of Rights) restated to apply also to personal data. So, should the authorities for any reason wish to access personal data then they will need to pursue the same procedures as they would need to if they were, for example, to wish to search your house.