Abstract: Systems and methods for legal interception of a transmission through a land based network to or from a mobile station based at least in part on the satisfaction of spatial criteria whereby a geographic area is identified and the location of one or more mobile stations is determined. Transmissions to or from one or more mobile stations may be intercepted based on the mobile stations being located within the geographic area, the distance between multiple mobile stations being less than a predetermined distance, or the distance between one or more mobile stations and a reference object being less than a predetermined distance. Intercepted transmissions as well as any associated data may be forwarded to one or more authorized entities, such as law enforcement agencies.