[[File:3 hop.PNG|center|650px|thumb|Illustration of how the 3 hop rule works after a [[FISA]] warrant is obtained. A typical subject has 50 contacts in their phone or email. The same legal [[surveillance]] authority is applied to those 50 contacts, and then to your contacts' contacts. | [[File:3 hop.PNG|center|650px|thumb|Illustration of how the 3 hop rule works after a [[FISA]] warrant is obtained. A typical subject has 50 contacts in their phone or email. The same legal [[surveillance]] authority is applied to those 50 contacts, and then to your contacts' contacts. |