To ensure that the CDC and its grantees got the message, the following language was added to the final  appropriation: “none of the funds made available for injury prevention and control at the Centers for Disease Control and Prevention may be used to advocate or promote gun control.”
Precisely what was or was not permitted under the clause was unclear. But no federal employee was willing to risk his or her career or the agency’s funding to find out. Extramural support for firearm injury prevention research quickly dried up. Even today, 17 years after this legislative action, the CDC’s website lacks specific links to information about preventing firearm-related violence.
When other agencies funded high-quality research, similar action was taken. In 2009, Branas et al published the results of a case-control study that examined whether carrying a gun increases or decreases the risk of firearm assault. In contrast to earlier research, this particular study was funded by the National Institute on Alcohol Abuse and Alcoholism. Two years later, Congress extended the restrictive language it had previously applied to the CDC to all Department of Health and Human Services agencies, including the National Institutes of Health.
Head, meet sand. More by Arthur Kellermann and Frederick Rivara at JAMA.
UPDATE: Still more by Arthur Kellermann on guns on the Health Affairs blog.