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When a Turnitin is active on a D2L dropbox, students see an icon indicating that:
Activate Turnitin Tools in your D2L Dropbox
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You are still able to activate a Turnitin Similarity Check and other tools on a dropbox, after it has collected student assignment submissions. However, you will likely need to manually direct Turnitin to check each and every paper. This is done by clicking the file tray icon under Turnitin Similarity Report, on the Dropbox's submission page:
