by Bill Gertz

About the author: Bill Gertz is a defense and national security reporter for the Washington Times. He has also written articles for the National Review and Weekly Standard and is author of Breakdown: How America’s Intelligence Failures Led to September 11.

American spies are increasingly women and foreign-born citizens who succeed in passing secrets as volunteers, according to a Defense Department report on espionage.

About 20 Americans have committed espionage or tried to spy since 1990, the report states, and the globalization of economics and the information- technology revolution have made it difficult to stop government employees from giving away or selling secrets.

The Globalization of Espionage

“It does point to a kind of confluence of factors&mdash...