How to tell who accessed file

Hi,
My apologies in advance that this is only loosely related to C++, but I don't know a better place to ask it. Normally, I would ask it on Stack Overflow, but it seems someone has banned our entire university from Stack Overflow, since we all share the same ip.
Anyways,
Is there a way to tell when the file was last accessed (copied, read, ftp'ed) by a user in a Unix server. I know file modified time, but the file I am interested would not have been modified.
Specifically, I had to submit an assignment last night for our class, and I wan to know if root accessed it yet, so I know whether or not I can start tinkering around with it, and use it as practice for my final exam. I don't want to make modifications that may cause errors and then my teacher pulls the file and I get a 0 for it not compiling.

Chris
No. Only the access time is maintained, and even that can be switched off (with a mount option).
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