WASHINGTON, March 14 — Federal investigators are scrutinizing television segments in which the Bush administration paid people to pose as journalists praising the benefits of the new Medicare law, which would be offered to help elderly Americans with the costs of their prescription medicines.

The videos are intended for use in local television news programs. Several include pictures of President Bush receiving a standing ovation from a crowd cheering as he signed the Medicare law on Dec. 8.

The materials were produced by the Department of Health and Human Services, which called them video news releases, but the source is not identified. Two videos end with the voice of a woman who says, "In Washington, I'm Karen Ryan reporting."

But the production company, Home Front Communications, said it had hired her to read a script prepared by the government.

Another video, intended for Hispanic audiences, shows a Bush administration official being interviewed in Spanish by a man who identifies himself as a reporter named Alberto Garcia.

Another segment shows a pharmacist talking to an elderly customer. The pharmacist says the new law "helps you better afford your medications," and the customer says, "It sounds like a good idea." Indeed, the pharmacist says, "A very good idea."

The government also prepared scripts that can be used by news anchors introducing what the administration describes as a made-for-television "story package."

In one script, the administration suggests that anchors use this language: "In December, President Bush signed into law the first-ever prescription drug benefit for people with Medicare. Since then, there have been a lot of questions about how the law will help older Americans and people with disabilities. Reporter Karen Ryan helps sort through the details."

The "reporter" then explains the benefits of the new law.