in rio de janeiro, carrying a form of personal identification at all times is mandatory.

a passport should be carried all the times or, perhaps a safer and  more practical option, at least a copy of a passport including a copy of the page showing the entry date, and the page showing a visa.

by law, a document or at least a copy of a valid document must be carried at all times.

in addition to documents being required by local authorities at random checks, passports or copies of passports are required when going into hospitals and emergency rooms.

in fact, documents are also required to enter most discos, clubs, and night-time establishments as the bill is usually presented on exit, when showing the same document used to enter and open a tab.