Articles 18 & 19 of the 1853 constitution protect privacy. Article 18(2) reads, “The residence is inviolable, as are letters and private papers; and a law shall determine in what cases and for what reasons their search and seizure shall be allowed,” while Article 19 reads, “The private actions of men that in no way offend public order or morality, nor injure a third party, are reserved only to God, and are exempt from the authority of the magistrates” (Constitute Project, “Argentina 1853, reinst. 1983, rev. 1994”).

References:

https://www.constituteproject.org/constitution/Argentina_1994