In this blog post, we examine the extent to which scientists should bear legal responsibility for the social and environmental problems caused by the adverse effects of chemical substances.
Rachel Carson’s ‘Silent Spring’ is a seminal work that exposed the harmful effects of chemical use on the environment. Since the book’s publication, controversy surrounding the use of chemicals has persisted to this day. However, chemicals are utilized in a wide variety of fields, ranging from household detergents to industrial sites, the medical field, agriculture, and the military. Therefore, it is no longer feasible to debate the use of chemicals in and of itself, as they have become an inseparable part of modern life. Nevertheless, as Carson pointed out in her book, the adverse effects of chemicals are undeniable—their toxicity harms countless living organisms and leads to environmental pollution and various health issues. So, who should be held legally responsible for the various social and environmental problems caused by the use of new chemicals? Should the responsibility lie with the scientist who developed the substance?
To get straight to the point, my answer to this question is: “If a scientist has sufficiently fulfilled their responsibilities beforehand, they need not bear legal liability for problems that arise afterward.” The “responsibilities beforehand” referred to here mean conducting safety tests in accordance with relevant laws and standards, and fully informing users of precautions for use and potential risks. If a scientist has faithfully fulfilled these two responsibilities before the hazards of a chemical substance become apparent, I believe they need not bear legal liability for any problems that arise thereafter.
The reason is, first, that a scientist cannot predict every possible scenario regarding the conditions under which the chemical substance they developed will be used. Let’s take the pesticides primarily discussed in ‘Silent Spring’ as an example. Pesticides can potentially be used anywhere pests are present. However, environmental conditions such as temperature, sunlight, and humidity vary from one application site to another, and human lifestyles, the types of crops being grown, and the presence of other chemicals or organisms in the vicinity also differ. Due to these countless variables, it is virtually impossible to predict every possible environmental scenario in which a newly developed chemical might be encountered, and it is also practically difficult to establish usage standards tailored to each specific condition.
A prime example is malathion. Malathion was widely used because it was known to be relatively less toxic than other pesticides in the same class. However, unexpected risks were identified when it became known that its toxicity could increase significantly when exposed alongside other organophosphate compounds. A substance that scientists had deemed relatively safe in a laboratory setting exhibited unexpected toxicity when it interacted with specific chemicals. That said, it is practically impossible to test every new chemical substance by mixing it with every other substance on Earth to verify its reactions.
During discussions on this topic, some argued that, thanks to advances in science and technology that allow us to analyze the structures of chemical substances, we can sufficiently predict the toxicity of new substances by comparing them to existing ones. However, as explained earlier, chemical substances are subjected to a wide variety of conditions in real-world environments. Furthermore, just because a substance has a similar structure to an existing one does not mean it possesses the same characteristics; even a change in a single functional group can result in entirely different properties. Therefore, it is difficult to fully predict the hazards of a new substance based solely on a simple comparison with other substances.
Malathion, mentioned earlier, was also expected to be toxic based on comparisons with existing organophosphate compounds, so a safety assessment was conducted prior to its use, and it was determined to be relatively less toxic than other substances. However, an unexpected reaction was later observed in which its toxicity increased during interactions with other organophosphate substances, which caused new problems.
Second, while chemical substances may inherently pose a certain level of risk, that risk ultimately varies greatly depending on how they are used. Scientists generally develop new chemical substances to enhance human convenience and ensure survival. However, new chemical substances carry both benefits and risks. Therefore, the impact a substance will have on human life depends not only on the scientists who developed it but also significantly on the behavior of the people who actually use it.
Alfred Nobel’s purpose in developing dynamite was to increase the efficiency of mining operations and contribute to industrial development. However, dynamite’s explosive properties were not limited to mining; it was actively utilized in warfare and eventually came to be used as a weapon of mass destruction. In this way, the manner in which science, technology, and chemical substances are utilized is not determined by a single scientist alone but by the choices of society and users. Therefore, responsibility for the outcomes cannot be placed solely on scientists.
I believe that chemical substances developed by scientists for the benefit of humanity share many similarities with new drugs. Just as new drugs are created to treat diseases, most chemical substances are also developed with the good intention of making human life more convenient. However, just as new drugs can cause side effects alongside their therapeutic effects, chemical substances can also possess a certain degree of toxicity. That said, researchers or pharmaceutical companies do not bear full legal responsibility every time side effects from a new drug occur. New drugs are approved for use only after their safety and efficacy have been confirmed through rigorous preclinical and clinical trials, as well as regulatory review; even after approval, precautions for use and information on side effects are continuously provided and monitored. Furthermore, the packaging and accompanying documentation for pharmaceuticals contain detailed instructions on precautions to take during use and possible side effects. Similarly, while scientists who develop new chemical substances are not required to bear full legal responsibility for adverse effects caused by those substances, they do have a role to play before the substances are put into use. Scientists must thoroughly verify the safety of new substances in accordance with relevant laws, regulations, and scientific standards. Furthermore, I believe they have a minimum responsibility to fully inform and educate potential users about precautions for use, expected side effects, and risks—even for substances whose safety has been confirmed.
In fact, a significant number of accidents involving chemical substances are related to users’ failure to follow safety guidelines or a lack of awareness of the risks. ‘Silent Spring’ features cases such as a doctor who suffered brain damage from spraying DDT and malathion on his lawn every week, and a woman who lost her baby after using an insecticide to eliminate cockroaches in her new home. These cases were tragedies that occurred because users applied the chemicals without fully understanding their dangers or proper usage methods. The book also cites a study investigating how many people actually read the warning labels on pesticide containers. It found that out of 100 people using spray-type pesticides, fewer than 15 were even aware that warning labels were printed on the containers. This demonstrates not only a lack of awareness of the risks among users but also the limitations of companies in adequately communicating those risks. To prevent such accidents, scientists must make efforts to sufficiently inform the public of the hazards of chemicals in advance and ensure that relevant education is provided. I believe that if a scientist who developed a specific chemical had faithfully fulfilled this responsibility, they should not be held legally liable for problems arising from subsequent misuse or abuse.
Scientists cannot predict every possible scenario regarding the environment in which the chemicals they develop will be used, nor can they foresee exactly who will use them or for what purposes. Given this, I believe that if a scientist conducts an appropriate level of safety verification prior to the chemical’s use and fully informs users of the risks and proper usage methods, they should not be held legally liable for all subsequent problems arising from that chemical. However, at present, scientists do not have sufficient opportunities to directly explain the risks of chemical substances to general users, and users’ safety awareness regarding these substances remains lacking in some respects. Furthermore, the appropriate standards for safety verification may feel somewhat ambiguous from the users’ perspective. Therefore, rather than merely debating who should bear responsibility for harm caused by chemical substances, priority should be given to efforts to create an environment where chemical substances can be used more safely. This involves continuously improving the current system—such as expanding opportunities for scientists to directly explain the risks of chemical substances to users and establishing mechanisms to incorporate not only experts’ but also users’ opinions in the process of setting safety verification standards.
