US television network ABC may have to pay a fine of $1.4m (£707,000) for airing an episode of NYPD Blue which depicted female nudity.
NYPD Blue ran on ABC until 2005
The Federal Communications Commission (FCC) said the 2003 show had "multiple, close-up views" of a woman's buttocks before the US watershed.
The FCC deems "sexual or excretory activities" shown in an "offensive" way before 2200 as indecent.
ABC has rejected the claims, saying the buttocks are not a sexual organ.
The proposed penalty has been imposed on all 52 of ABC's stations who broadcast the episode.
The scene in the police drama, which ran from 1993-2005, shows a boy surprising a naked woman as she prepared to take a shower.
The FCC said it received several complaints about the sequence, which also showed one of the woman's breasts.
The FCC acted against Jackson's "wardrobe malfunction"
An ABC spokeswoman said that the programme was broadcast with parental warnings and that "the realistic nature of NYPD Blue's storylines was well-known to the viewing public".
The broadcaster has said it will appeal against the decision, which is the second largest indecency fine imposed on a broadcaster.
In 2006, the FCC imposed a $3.6m (£1.8m) against CBS for an episode of Without A Trace, which was settled for $300,000 (£152,000).
The FCC has waged a battle against TV indecency in recent years, with the US authorising a huge increase in fines.
Janet Jackson's breast exposure during the 2004 Super Bowl on live TV prompted the organisation to impose a fine of $550,000 (£278,000) on 20 CBS-owned TV stations.
The network has been embroiled in a long-running court battle against the penalty.