Visitors traveling to the United States from more than 150 countries are now required to submit to photographing and fingerprinting, while others from mostly European countries are not.

The new U.S. regulations went into effect Monday, allowing instant checks on an immigrant's or visitor's criminal background.

In response, a Brazilian judge ordered that all U.S. citizens be fingerprinted and photographed upon entering Brazil. The change has forced many American citizens to wait for hours at Brazilian airports.