Article 29. -"Correspondence and other private documents are inviolable and cannot be occupied or examined except by virtue of a written order from a competent authority, for specific purposes and though legal formalities. (...) those issues other than the purpose of the occupation or exam will be kept confidential."
Likewise, private telephone communications are inviolable and cannot be intercepted(...).
Article 42 to 44.- "Right to Access Information and HD."