Can you be denied entry to the US? What travelers should know.

Nearly 1 million people enter the U.S. each day, according to U.S. Customs and Border Control.

Very few travelers are turned away, but it can happen. Reports of cellphone searches at airports and tourists and visa holders being detained, deported or denied entry earlier this year sparked wider concerns.

Here’s what travelers should know about entering the U.S.

That depends on your legal status.

All U.S. citizens must present a U.S. passport before boarding international flights leaving from or heading to the U.S., according to a Customs and Border Protection FAQ. That includes babies and children. CBP says a NEXUS Card is also acceptable for U.S. citizens departing from designated Canadian airports.