Recital 33

(33) At the time of data collection, it is often not possible to fully identify the purpose for which the personal data are processed for scientific research purposes; therefore, data subjects should be able to consent to certain areas of scientific research, provided that the studies comply with accepted ethical standards in the field of scientific research; data subjects should only be able to consent to certain areas of research or elements of research projects, if the intended purpose allows.

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Recital 33 of the preamble to the GDPR | ODO 24