Assistant Health Minister Tolbert Nyenswah told a press conference Thursday that the man’s contagiousness, in Liberia at least, was limited because he was not symptomatic at the time he left the country.

Kesselly, of the airport authority, said that passenger noncompliance with exit procedures raises the prospect of a stricter security response.

“Knowingly making false declaration is not a joke. We ask you these things because we don’t want a police state where everybody is put under a hundred percent quarantine, where we can follow you every minute of the day to monitor every movement that you make,” Kesselly said. “We expect people to do the honorable thing.”