Abstract: Network traffic associated with a user is lawfully intercepted by mirroring data packets flowing to and from the user for which interception has been designated. A unique packet structure enables analysis of mirrored data packets of any network type. In one implementation, a packet structure comprises routable packets that encapsulate the mirrored packet stream. The routable packet structure may be formed by prepending a correlation header to each mirrored packet. The correlation header includes a routing header to allow the mirrored packets to be transportable across the public Internet. In addition, an intercept header may be embedded within the correlation header to easily support various analyzer-specific implementations. The intercept header may include a version field that is extensible for the various analyzer implementations.