The amount of money available today for studying the impact of firearms is a fraction of what it was in the mid-1990s, and the number of scientists toiling in the field has dwindled to just a handful as a result, researchers say.
The dearth of money can be traced in large measure to a clash between public health scientists and the N.R.A. in the mid-1990s. At the time, Dr. Rosenberg and others at the C.D.C. were becoming increasingly assertive about the importance of studying gun-related injuries and deaths as a public health phenomenon, financing studies that found, for example, having a gun in the house, rather than conferring protection, significantly increased the risk of homicide by a family member or intimate acquaintance.
Alarmed, the N.R.A. and its allies on Capitol Hill fought back. The injury center was guilty of “putting out papers that were really political opinion masquerading as medical science,” said Mr. Cox, who also worked on this issue for the N.R.A. more than a decade ago.
Initially, pro-gun lawmakers sought to eliminate the injury center completely, arguing that its work was “redundant” and reflected a political agenda. When that failed, they turned to the appropriations process. In 1996, Representative Jay Dickey, Republican of Arkansas, succeeded in pushing through an amendment that stripped $2.6 million from the disease control centers’ budget, the very amount it had spent on firearms-related research the year before.
“It’s really simple with me,” Mr. Dickey, 71 and now retired, said in a telephone interview. “We have the right to bear arms because of the threat of government taking over the freedoms that we have.”
The Senate later restored the money but designated it for research on traumatic brain injury. Language was also inserted into the centers’ appropriations bill that remains in place today: “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.”
The prohibition is striking, firearms researchers say, because there are already regulations that bar the use of C.D.C. money for lobbying for or against legislation. No other field of inquiry is singled out in this way.
In the end, researchers said, even though it is murky what exactly is allowed under this provision and what is not, the upshot is clear inside the centers: the agency should tread in this area only at its own peril.
“They had a near-death experience,” said Dr. Arthur Kellermann, whose study on the risks versus the benefits of having guns in the home became a focal point of attack by the N.R.A.
In the years since, the C.D.C. has been exceedingly wary of financing research focused on firearms. In its annual requests for proposals, for example, firearms research has been notably absent. Gail Hayes, spokeswoman for the centers, confirmed that since 1996, while the agency has issued requests for proposals that include the study of violence, which may include gun violence, it had not sent out any specifically on firearms.