In the long view, modern history is the story of increasing rights of control over your body – for instance, in matters of reproduction, sex, where you live and whom you marry. Medical experimentation is supposed to be following the same historical trend – increasing rights of autonomy for those whose bodies are used for research.

Indeed, the Nuremberg Code, the founding document of modern medical research ethics developed after the Second World War in response to Nazi medical experiments, stated unequivocally that the voluntary, informed consent of the human subject is essential. Every research ethics code since then has incorporated this most fundamental principle. Exceptions to this rule are supposed to be truly exceptional.

Yet today, more and more medical experimenters in the United States appear to circumvent getting the voluntary, informed consent of those whose bodies are being used for research. What’s more, rather than fighting this retrograde trend, some of the most powerful actors in medical research are defending it as necessary to medical progress.

A few years ago, I fell in with a growing group of professionals in medicine and allied fields such as bioethics who have mobilised to defend the right to informed consent in medical experimentation. As a historian of medicine, I had worked since 1996 with intersex rights activists on improving care for children born with bodies in between the male and female types. In 2009, colleagues alerted me that a group of parents judged ‘at risk’ of having a child born with a particular genetic intersex condition appeared to be unwitting subjects in a medical experiment.

A major researcher and physician was promoting the prenatal use of a drug (dexamethasone) aimed at preventing intersex development. Targeting would-be parents who knew they had this condition running in their families, the researcher told them that the ‘treatment’ had been ‘found safe for mother and child’.

In fact, the US Food and Drug Administration (FDA) has not approved dexamethasone for preventing intersex development, much less found it ‘safe’ for this use. Indeed, the FDA has noted dexamethasone causes harm in foetal animals exposed to it. No one seems to have told the parents that this ‘treatment’ had not gone through anything like the normal route of drug approval: there has been no animal modelling of this use, no blinded control trial for effectiveness, and no long-term prospective safety trials in the US, where thousands of foetuses appear to have been exposed.

Shockingly, at the same time that this researcher was pushing the ‘treatment’ as ‘safe’, she was obtaining grants from the US National Institutes of Health (NIH) to use the same families in retrospective studies to see if it had been safe. A Swedish research group has recently confirmed – through fully consented, prospective studies – that this drug use can cause brain damage in the children exposed prenatally.

As I sought allies in defending the rights of these families, I discovered that, while this was an especially egregious case of failure to obtain informed consent to what amounted to a medical experiment, the lapse was not unique. Public Citizen’s Health Research Group, a Washington-based NGO, has been leading the work in tracking cases where medical researchers fail in their obligations to obtain informed consent.

Recently, Public Citizen, together with the American Medical Student Association, sounded an alarm about two clinical trials, one called iCOMPARE, the other FIRST. In these studies, researchers extended the working hours of newly trained physicians to see if these physicians and their patients were better or worse off with the most inexperienced doctors working longer, more tiring shifts.

The young doctors used in these studies were not given the option of not participating. If their residency programmes participated, they were in. More concerning, their patients were never informed that they were experimental subjects, even though a primary research goal was to see if patients treated by residents working longer shifts would experience higher rates of harm.

Some studies tracked by Public Citizen reveal downright bizarre ethical mistakes. A recent study funded by the US Department of Health and Human Services, led by a US Department of Veterans Affairs researcher, sought to determine whether, if brain-dead kidney donors’ bodies were cooled after brain death, living recipients of the transplanted kidneys did better. The researchers decided they didn’t need to get voluntary consent to the experiment from the living kidney recipients. They simply maintained the dead donors were the experimental subjects.

The largest contemporary fight over failure to obtain informed consent has been over the Surfactant Positive Airway Pressure and Pulse Oximetry Trial (or SUPPORT). This was a large NIH-funded study meant to determine, in part, whether higher or lower levels of oxygen after birth provided very premature babies with benefit or harm. The consent forms for this study did not inform the parents that the experiment’s purpose was to see if, by being randomly assigned to one of two experimental oxygen ranges, babies end up more likely to be blind, neurologically damaged or die.

Most parents also weren’t informed that the researchers would use experimental measuring devices meant to ‘blind’ professional caregivers to the babies’ real oxygen levels to try to make the study more rigorous. Researchers told many parents that the study involved no special risks because all the procedures in the research were supposedly standard of care. This was a demonstrably untrue claim.

In this case, the US Office for Human Research Protections (OHRP) – an agency meant to protect the rights of people in federally funded research – agreed with Public Citizen and an allied group of more than 40 of us in medicine and bioethics that the informed consent for this trial was seriously inadequate. But in a series of emails meant to stay private, top NIH officials pressured the OHRP to back off its criticisms. OHRP is supposed to oversee NIH’s work, not the other way around!

NIH leaders also partnered with the editor of The New England Journal of Medicine to publicly defend this study. The journal’s editor-in-chief tried actively to limit the ability of us critics to respond. Meanwhile, the parents were never officially informed of what happened to their babies.

Those defending these troubling studies often argue that elaborate consent procedures can get in the way of obtaining important scientific results. They say that subjects might encounter the risks of the experiment even in ‘normal’ patient care, so we might as well engage them in studies without scaring them off through frightening research consent forms.

It is true that the current research ethics system in the US is cumbersome, inefficient and dysfunctional. Researchers often find themselves confused and frustrated by the bureaucracies of research ethics systems.

But that is no excuse not to vigorously maintain the first principle of the Nuremberg Code: the voluntary consent of the subject is essential. We can’t afford the risk to medical research that sloppy ethics entail; when the public finds out about the circumvention of informed consent – as in the case of the infamous US Public Health Service syphilis study at Tuskegee – the damage to the integrity and authority of the medical research community is inevitably significant and long-lasting.

The tenets of the Nuremberg Code were not meant only for Nazis. If Nazis presented the only danger to people being used for medical experiments, eliminating the Nazis would have solved our problems. The Nuremberg Code was written to guide all of us, because good intentions are not enough.