Is it time to change the paradigm?

Published research has suggested that infants whose mothers received opiates, barbiturates, or nitrous oxide gas during labor are significantly more likely to become addicted to opiates if they experiment with drugs in later life. Why has no one further investigated this hypothesis? What if these researchers are correct? In the future will there be class action lawsuits against the medical and nursing research communities for failure to follow up on this question? Is it time to change the research paradigm?