Few government programs seem as sacrosanct as funding for medical research. Despite continuing budget constraints, both Democrats and Republicans regularly pledge to increase funding for the National Institutes of Health and other government medical research.

This week, Eric Cantor of Virginia, the second-ranking House Republican, called for continued government funding for such research. "There is an appropriate and necessary role for the federal government to ensure funding for basic medical research," Cantor declared, suggesting that federal funds used for social-science research should be shifted to medical programs instead.

Polls show that a strong majority of U.S. voters support funding medical research. Yet there is no reason that it shouldn't receive the same critical scrutiny as any other federal program.

First, are the benefits worth the cost? Terence Kealey, vice chancellor of the University of Buckingham in England and author of "The Economic Laws of Scientific Research," says that a review of historical evidence shows little correlation between the amount of money governments spend on scientific research and the returns from such investment. Kealey studied the full range of scientific research, including medical research.

Second, there is no proof that the private sector is incapable of financing medical research, either for profit or as charity. While private companies undoubtedly have an incentive to fund research that they believe will ultimately prove profitable, even "orphan" drugs -- one of the least profitable lines of research, as they are designed for a small number of people with rare disorders -- have found funding through the Bill and Melinda Gates Foundation and other charities.

Currently 60 percent to 70 percent of medical research is privately paid for, but research from the Paris-based Organization for Economic Cooperation and Development suggests that if private companies believe governments will pay for research, they may simply withdraw their own money. Thus, government funding doesn't result in more research, just a different funding stream.

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No evidence shows that government bureaucrats have either the qualifications or the incentives to make better decisions than private individuals and organizations about what research should be funded. After all, government involvement in research inevitably injects politics into scientific questions. Even former National Institutes of Health director Elias Zerhouni has warned that congressional mandates to spend money on specific diseases have undermined the agencies' research. And Cantor's statement itself suggested the politicization of government research through his desire to transfer funds from research that he doesn't like (social science) to research that he favors (medical).

Similarly, researchers are far more likely to receive government grants if they belong to the scientific "club," a good-old-boys network of researchers. Some researchers worry they can have their grants cut for challenging the scientific consensus or for reaching conclusions that are politically controversial. This is dangerous, because a willingness to rethink current theories is a key to scientific advancement.

Moreover, government funding of medical research inevitably entangles the government in difficult moral issues. Recall the bitter debate over government funding for stem-cell research. Other issues that have stirred up recent political controversy include the use of animals for testing, Centers for Disease Control and Prevention research into gun violence, and NIH research on sexual practices. We even saw President Barack Obama's choice for NIH director, Francis Collins, attacked for being an evangelical Christian.

Private funding avoids such moral and philosophical quandaries by allowing individual donors or corporate shareholders to exercise their personal consciences.

An industrial policy for medical research is still an industrial policy -- and likely to have the same inefficiencies and unintended consequences. Or as Kealey put it, "Scientists may love government money, and politicians may love the power its expenditure confers upon them, but society is impoverished by the transaction."

Michael D. Tanner is a senior fellow at the Cato Institute. This is from Bloomberg View.