Which option best reflects the justice principle in TCPS 2 regarding participant selection?

• A. Recruit only from populations with no vulnerability.
• B. Distribute burdens and benefits fairly across groups, avoiding exploitation of vulnerable populations.
• C. Exclude all vulnerable groups from participation.
• D. Distribute burdens and benefits fairly across groups, with explicit safeguards for vulnerable populations.

Answer: (D)

Justice in TCPS 2 means ensuring that research burdens and benefits are distributed fairly across groups while protecting those who may be more vulnerable to coercion, influence, or harm. The best choice embodies this by requiring fair distribution of burdens and benefits with explicit safeguards for vulnerable populations, so inclusion is just and protections are in place when vulnerabilities exist. This approach aligns with ethical practice such as providing access to potential benefits without exploiting anyone, and implementing safeguards like enhanced consent processes, independent oversight, or community engagement when vulnerability is present. Recruiting only from populations with no vulnerability would undermine fairness and exclude groups that could benefit; excluding all vulnerable groups is paternalistic and unjust; distributing burdens and benefits fairly without safeguards risks harming those at greater risk of harm or coercion.