Don't you think that gives the people who are falsifying results rather an easy time?

If Bob falsifies data and someone e-mails him, asking him to send them rope to hang him with, he can simply delete the e-mail.

Or claim he forgot the details of the analysis. Or claim it was handled by a grad student who left. Or claim the info was lost when a hard drive broke. Or claim the data was the intellectual property of College A and he can't access it now he's at College B. Or claim privacy or copyright rules cover the key data. Or that they don't have a license to the software that can open the data files any more. Or any of a dozen other things.