Final answer:
If a human subject involved in ongoing research becomes a prisoner, the researcher must notify the IRB promptly and ensure the safety of the subject while continuing the research activities.
Step-by-step explanation:
The statement is true. When a human subject involved in ongoing research becomes a prisoner, the researcher must promptly notify the Institutional Review Board (IRB) and take appropriate steps for the safety of the subject. Although the specific details are not provided, in such cases, the subject's health is a primary concern rather than ongoing data collection. However, research activities, including the use of the study drug, may continue with additional protections in place.