Nearly two years after the information was made available to it, the Department of Homeland Security has decided to start using a massive database that can flag stolen passports.

According to The Wall Street Journal, the European police agency Interpol has amassed information on nearly 7 million stolen passports worldwide.

The U.S. is finally plugging in to that system at the end of the year.

Numerous known terrorists use stolen passports, including a group that was caught in Europe earlier this year as they were headed for the U.S., the Journal reported.