Using deception in research is acceptable even if you don't notify the participants after the study is concluded.

Question

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Deception in research is generally only acceptable if it is necessary for the study and safeguards are in place to minimize any harm to participants. Informed consent is also a critical ethical principle in research, and participants should be notified of the use of deception as soon as possible after the study is concluded.

Using Deception in Research Is Acceptable Even If You Don't