FactCheck.org’s SciCheck feature focuses exclusively on false and misleading scientific claims that are made by partisans to influence public policy. It was launched in January 2015 with a grant from the Stanton Foundation. The foundation was founded by the late Frank Stanton, president of CBS for 25 years, from 1946 to 1971.
Politicians of both political parties have blamed either the Trump or the Biden administration for the arrival of the New World screwworm, a flesh-eating fly that affects the cattle industry, in the U.S. after decades of eradication. But experts say the reasons are different or more complicated than either side is saying — and that it’s no one administration’s fault.
President Donald Trump has repeatedly blamed vandals for damaging the new blue lining of the Lincoln Memorial Reflecting Pool, which is now peeling, as well as for algae in the water. But the administration has not provided evidence to back up the president’s claims. Experts say the pool’s ills have a variety of plausible explanations that do not involve intentional harm.
President Donald Trump has touted more than $500 billion in prescription drug savings over 10 years from his policies. But the savings are largely aspirational, and not based on the more limited actions the administration has taken so far.
In a May 16 Truth Social post, President Donald Trump cited updated climate change scenarios to misleadingly claim that experts had “admitted” prior climate change projections “were WRONG! WRONG! WRONG!” The regularly scheduled revision reflects in part the progress the world has made on moving away from fossil fuels.
In defending his record on measles, Health and Human Services Secretary Robert F. Kennedy Jr. twice said during a recent Senate hearing, “We promote” the measles vaccine. While it’s true that the Centers for Disease Control and Prevention continues to recommend the shot, Kennedy has rarely made an unequivocal endorsement of it, even as the nation has seen an alarming rise in measles cases.
The Food and Drug Administration in recent months has approved a small number of drugs quite quickly under a new expedited review program. But Health and Human Services Secretary Robert F. Kennedy Jr. has overstated the impact of the program by making misleading comparisons to the pace of drug approvals in the past.
In the midst of a court battle over whether to continue to allow access by mail to the medication abortion pill mifepristone, Republican lawmakers have claimed that 10% or more of women who take the drug have serious side effects. A 2025 report from an anti-abortion group that put forward the figure has been criticized by reproductive health researchers for methodological issues and a lack of transparency about its data source.
During an April 17 congressional hearing, Health and Human Services Secretary Robert F. Kennedy Jr. called for retraction of a new Danish study that didn’t find a link between Tylenol and autism, repeatedly calling it “garbage” and baselessly suggesting that it was industry-generated and “fraudulent.”
It’s a common, misleading refrain in anti-vaccine circles: Childhood vaccines may be unsafe because few if any have been tested in placebo-controlled trials before being approved. But that claim misunderstands the vaccine safety testing process and takes advantage of a narrow definition of a placebo, scientists told us.
Elon Musk this week amplified an unfounded claim, based on a distortion of vaccine safety monitoring data, that COVID-19 vaccines killed tens of thousands of people in Germany. The vaccines saved millions of lives worldwide during a deadly pandemic, and serious side effects or deaths from vaccination are rare.