Is the first immigrant of a day always allowed to enter the country?

I've noticed after the first few days into a game that every first immigrant of a day has valid papers and can be approved too enter the country.

Does the game always give you an immigrant with valid papers as the first person to pass by your booth on any given day?

Solution 1:

No, the first immigrant is not always allowed to enter the country.

I encountered an immigrant with a forged stamp on her entry permit and she was detained.

Solution 2:

According to the timeline on the Papers, Please! wiki:
the first entrant will always be allowed to enter on days 1, 2, 3, 6, 7^†, 8, and 28
the first entrant will always not be allowed to enter on days 5, 11, 14, 18, 19, 24, and 25

^{† On day 7, you still need to verify some information, you cannot just approve them immediately.}

In general (except for just day 21?), when a new feature is introduced, the first person at the booth gives the player an example of that feature.