Lack of Coercion
Subjects, including students who participate in classroom experiments or faculty scholarship, must not be induced to participate by means or in circumstances that might affect their ability to decide freely. When course credit is offered for participation in research, some other mechanism to earn that credit must also be made available to those students who choose not to participate as human subjects. Rewards for participating should be in line with the burden imposed by participating, to avoid undue influence on a person's ability to freely choose to participate (or not).
Researchers must inform subjects that they are free to withdraw from active participation in the research at any time. Subjects who indicate a desire to withdraw must be allowed to do so promptly and without penalty or loss of benefits to which any subject is otherwise entitled. At the minimum, this right must be clearly stated as part of the informed consent statement.