How Did People Watch TV Before the Internet?

We’re watching NCIS, and I can’t help but wondering what their jurisdiction is. If the show is in any way representative, they investigate pretty much anything.

The Naval Criminal Investigative Service (NCIS) has primary investigative and counterintelligence jurisdiction within the Department of the Navy. NCIS has a global presence, maintaining a worldwide field structure that supports Navy and Marine Corps requirements in over 140 locations around the globe, including aboard every aircraft carrier and “big-deck” amphibious vessel. NCIS special agents are authorized by law to conduct arrests of military members and civilians alike, both on and off military installations.