The practice, which also occurred in the Clinton administration, is continuing despite President Bush's recent call for a clearer demarcation between journalism and government publicity efforts. "There needs to be a nice independent relationship between the White House and the press," Mr. Bush told reporters in January, explaining why his administration would no longer pay pundits to support his policies.

In interviews, though, press officers for several federal agencies said the president's prohibition did not apply to government-made television news segments, also known as video news releases. They described the segments as factual, politically neutral and useful to viewers. They insisted that there was no similarity to the case of Armstrong Williams, a conservative columnist who promoted the administration's chief education initiative, the No Child Left Behind Act, without disclosing $240,000 in payments from the Education Department.

What is more, these officials argued, it is the responsibility of television news directors to inform viewers that a segment about the government was in fact written by the government. "Talk to the television stations that ran it without attribution," said William A. Pierce, spokesman for the Department of Health and Human Services. "This is not our problem. We can't be held responsible for their actions."

Yet in three separate opinions in the past year, the Government Accountability Office, an investigative arm of Congress that studies the federal government and its expenditures, has held that government-made news segments may constitute improper "covert propaganda" even if their origin is made clear to the television stations. The point, the office said, is whether viewers know the origin. Last month, in its most recent finding, the G.A.O. said federal agencies may not produce prepackaged news reports "that conceal or do not clearly identify for the television viewing audience that the agency was the source of those materials."

It is not certain, though, whether the office's pronouncements will have much practical effect. Although a few federal agencies have stopped making television news segments, others continue. And on Friday, the Justice Department and the Office of Management and Budget circulated a memorandum instructing all executive branch agencies to ignore the G.A.O. findings. The memorandum said the G.A.O. failed to distinguish between covert propaganda and "purely informational" news segments made by the government. Such informational segments are legal, the memorandum said, whether or not an agency's role in producing them is disclosed to viewers.

Even if agencies do disclose their role, those efforts can easily be undone in a broadcaster's editing room. Some news organizations, for example, simply identify the government's "reporter" as one of their own and then edit out any phrase suggesting the segment was not of their making.

So in a recent segment produced by the Agriculture Department, the agency's narrator ended the report by saying "In Princess Anne, Maryland, I'm Pat O'Leary reporting for the U.S. Department of Agriculture." Yet AgDay, a syndicated farm news program that is shown on some 160 stations, simply introduced the segment as being by "AgDay's Pat O'Leary." The final sentence was then trimmed to "In Princess Anne, Maryland, I'm Pat O'Leary reporting."