Then why hasn't he been charged with a crime? Is it not treason (or something like that) to remove highly classified material and destroy it?

It just strikes me that somewhere something went lax. Yes, there is an amount of trust for those with clearances of that level. However, they should still be checked. My understanding was that the documents in question at the Archive were of a high security levels.

I would think that how he was able to it should be an issue. What other things have "left" the Archives that are of a sensitive nature?

Source: Houston Chronicle

Researchers at archives are under watchful eye
Associated Press

WASHINGTON - Pens are forbidden, pencils provided. Each scribbled piece of paper is checked, then stamped. Cell phones and jackets go into lockers. Prying eyes make sure nothing precious walks off.

Researchers at the National Archives are watched every step of the way.

Despite precautions like those, former Clinton national security adviser Sandy Berger somehow came away with material he wasn't supposed to have.

"The nation's record keeper" safeguards and makes available to the public 5 billion pieces of paper, 9 million photographs and 11 million maps and aerial photographs. But, there's a procedure everyone must follow.

A person must show a photo ID, obtain a researcher ID card and fill out a form telling what they're interested in looking at and the reason. An archives staffer looks at the pages leaving the room to make sure they either be photocopies with the archives' special mark, or notes taken by the researcher that are checked and stamped.