This is murky, so far as I'm concerned, and I don't know if anyone will have a clear or definitive answer, but:
---Student had a timed online writing assignment on Friday 28th.
---Student claims to have accessed and written assignment on Friday, but experienced submission problems, and so accessed and submitted again on Saturday 29th.
---Canvas analytics reports no activity or action by the student on Friday 28th.
---Student's explanation: they were using the TOR browser (more specifically, a version of the browser coded to the needs of the company they work for), and so Canvas wouldn't have logged their login.
Now . . . that to me smells ingenious and false, since it's my understanding that even using a browser like TOR can't prevent some site like Canvas (or Facebook, or anything) noting that you logged in at a given time, using your username and password. It could be that the version they're using is coded to prevent that, but it seems . . . unlikely. So, frankly, I think the student is pulling a fast one. But it could be true. Anyone have a strong feeling about this?