From: "Tony Ingenoso" 

Looks like they're classified as embassy staff.

http://www.fbi.gov/contact/legat/legat.htm

"...Presently, there are 45 Legal Attache (Legat) offices and four
Legat sub-offices. The FBI's Special Agent representatives abroad carry the
titles of Legal Attache, Deputy Legal Attache, or Assistant Legal
Attache... "

"John Cuccia"  wrote in message
news:fhi8cvsukho3ese6p3b12kjfgn6kpj0ac5{at}4ax.com...
jcuccia{at}bigfoot.com>
> wrote:
>
> On a related note, what gives FBI agents the authority to operate in
> foreign lands?

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