[nickserv]

If you're not a citizen of a country in the Schengen area then you'll need a passport.

And random checks at the border are permitted (i.e. contraband, people trafficking).

Also a country is allowed to re-implement border controls in case of crisis.

[jstanley]

> If you're not a citizen of a country in the Schengen area then you'll need a passport.

And how exactly do you show that you're a citizen of a country in the Schengen area without showing a passport?