NEW YORK (AP) - CBS is defying the traditional rules of television with its family police show "Blue Bloods."

NEW YORK (AP) CBS is defying the traditional rules of television with its family police show "Blue Bloods."

The drama starring Tom Selleck as a New York City police detective is the most popular scripted show on a network in over a decade. Last week it was CBS' second most-popular show all week after the comedy "The Big Bang Theory."

Television networks often consider Friday nights a programming graveyard, reasoning that many potential viewers are out on the town and not in their living rooms. But "Blue Bloods" has found a home there, and CBS believes that its strong family element has been enticing to viewers.

The Nielsen company says "Blue Bloods" is up 4 percent in viewers over last season.