Some 14 patients died during the three trials examined by the reports. In one trial, for an antibiotic, five out of seven patients died during the trial or soon after it finished. While there is no suggestion that every death merits compensation, critics say there has been no adequate investigation into whether compensation was appropriate in any of the cases. None has ever been paid.

At least eight other trials were carried out on hundreds of Bhopal gas victims. The Independent has evidence of patients who were unaware that they were taking part in a trial at all. The conduct of the trials has exposed the hospital to furious criticism from activists who say that survivors have been used as guinea pigs without proper informed consent.