"a sociologist wants to study a culture that occurs in some women's prisons: "state families," in which individual prisoners take on certain roles within a group of like-minded prisoners. there is previous evidence that younger prisoners will use older inmates who play the roles of grandparents as a resource before they will turn to staff for and advice. the lieutenant in charge of a dorm of long-term prisoners offers to gather volunteers to speak to the researcher and also offers to vouch for the integrity of the researcher. the use of this staff is: "

The use of this staff is "Wrong and is prohibited; subject selection needs to be free from intervention by prison authorities or prisoners."

Since prisoners are defenseless by their imprisonment, it is essential that examination with detainees don't force encourage imperatives on willfulness of their choices. Analysts must upgrade the willfulness of a detainee's assent by limiting the impact of other individuals, particularly staff or detainees who may practice discretionary expert over these potential subjects. Subject choice should be reasonable inside the populace that conceivably meets the examination criteria.