FBI agents trying to track the source of e-mailed bomb threats against a Washington high school last month sent the suspect a secret surveillance program designed to surreptitiously monitor him and report back to a government server, according to an FBI affidavit obtained by Wired News.

The court filing offers the first public glimpse into the bureau's long-suspected spyware capability, in which the FBI adopts techniques more common to online criminals.

The software was sent to the owner of an anonymous MySpace profile linked to bomb threats against Timberline High School near Seattle. The code led the FBI to 15-year-old Josh Glazebrook, a student at the school, who on Monday pleaded guilty to making bomb threats, identity theft and felony harassment.

In an affidavit seeking a search warrant to use the software, filed last month in U.S. District Court in the Western District of Washington, FBI agent Norman Sanders describes the software as a "computer and internet protocol address verifier," or CIPAV.

Sanders wrote that the spyware program gathers a wide range of information, including the computer's IP address; MAC address; open ports; a list of running programs; the operating system type, version and serial number; preferred internet browser and version; the computer's registered owner and registered company name; the current logged-in user name and the last-visited URL.

The CIPAV then settles into a silent "pen register" mode, in which it lurks on the target computer and monitors its internet use, logging the IP address of every computer to which the machine connects for up to 60 days.

Under a ruling this month by the 9th U.S. Circuit Court of Appeals, such surveillance -- which does not capture the content of the communications -- can be conducted without a wiretap warrant, because internet users have no "reasonable expectation of privacy" in the data when using the internet.

Somebody's Watching Me - Rockwell

I'm just an average guy with an average life
I work from nine to five, hey hell I pay the price
But I want is to be left alone in my average home
But why do I always feel like I'm in the Twilight Zone

CHORUS:
I always feel that somebody's watchin' me
And I have no privacy
I always feel that somebody's watchin' me
Is it just a dream?

When I come home at night
I bolt the door real tight
People call me on the phone I'm trying to avoid
Well, can the people on TV see me or am I just paranoid

CHORUS

When I'm in the shower, I'm afraid to wash my hair
I might open my eyes and find someone standing there
People say I'm crazy, just a little touched
But maybe showers remind me of Psycho too much
That's why...

I always feel like somebody's watching me
Who's playing tricks on me
I always feel like somebody's watching me
Tell me it can't be

I don't know anymore
Are the neighbors watching me
Well is the mailman watching me
And I don't feel safe anymore, oh what a mess
I wonder who's watching me now?
Who?
The IRS?

I always feel like somebody's watching me
Who's playing tricks on me
I always feel like somebody's watching me
I can't enjoy my tea!