The United States government has sanctioned a crackdown on visitors with visa overstays. Top on the list are Nigeria, Brazil, Venezuela, China and Colombia.
They are regarded as countries with the most total overstays that do not participate in the visa waiver programme.
The Trump Administration says it has a problem with such immigrants and is now determined to step up enforcement to try to cut down on the violations.
Consequently, the government is introducing a face scan for all US citizens travelling abroad.
The Department of Homeland Security (DHS) said this is aimed mainly at better tracking visa overstays and also at tightening security.
The Nation quoted the agency as saying this is the only way to successfully expand a programme that tracks non immigrant foreigners.
A report in May showed that more than 54 million visitors checked in last year – and nearly 630,000 of them didn’t go back home.