DNA information sought by State Dept?

[Eric J in MN]

Every year, the intelligence community asks the State Department for help collecting routine information such as biographical data and other "open source" data. DNA, fingerprint and other information was included in the request because, in some countries, foreigners must provide that information to the U.S. before entering an embassy or military base, a U.S. official said, speaking on condition of anonymity to discuss intelligence matters.

http://www.google.com/hostednews/ap/article/ALeqM5iCwOUu1rENW64bibeOe0Unz29F9Q?docId=27d57cd247cf417bbe09f6881abc0c52

Someone who wants to visit a US embassy may be told to give a DNA sample first? What countries? Is the DNA sample saliva?