I also get asked this a lot. The answer is - not easily.
(For reasons of conscience
and coding.) However...
It _
is_ possible. But it's not something most of us feel comfortable about.
It is not part of the stock code that comes with any
* forum.
It is possible to write a MySQL query to examine
any aspect of the database.
This is something that an admin can do (assuming they have access to the 'Database Tools || SQL command').
Although, I suspect anyone doing this would probably not sleep well at night.
* - that I am aware of, anyway...