The Security Intelligence Service has revealed details about the warrants it had in place up until June last year.
The SIS released the unclassified version of its annual report, which omits a lot of information for security reasons.
In it, SIS director Warren Tucker says it had 25 domestic interception warrants in place in the year to June 2008.
These allow it to collect or intercept documents or communications seen as necessary to maintaining national security.
The average length of time the warrants were in force was 153 days, with the copying of documents and the use of listening devices the main methods employed.
Dr Tucker says there were also foreign interception warrants, but there are no details about how many, or for what length of time they were in place.
