(CNN) -- A U.S. presidential commission has uncovered more details regarding human experiments conducted by American researchers in Guatemala in the 1940s in which the subjects were exposed to sexually transmitted diseases. The research reaffirms much of what is already publicly known: that between 1946 and 1948, U.S. researchers intentionally infected non-consenting subjects in Guatemala with STDs, in what the commission called a "clearly unethical historical injustice." The United States has apologized for the incident, and the government has been sued by some of the victims and their heirs. President Barack Obama asked the Presidential Commission for the Study of Bioethical Issues to uncover details of the research and to assure him that current rules protect people from unethical treatment.
@highlight
A presidential commission reaffirms previous reports on experiments in Guatemala
@highlight
Without their knowledge, subjects were exposed to STDs
@highlight
The commission will give its report to President Obama in September
The commission on Monday said it had completed the first of those tasks, and will present its findings to @placeholder in September.