Auditing For Queries With No Where Clause

I'd like to audit a table for any SELECT queries that are executed against it with no WHERE clause. I've read the documentation on DBMS_FGA carefully, and as close as I can tell, creating a policy with a NULL audit_condition causes all queries against the table to be audited, which isn't what I'm looking for.

What I'd like is something like this:

DBMS_FGA.ADD_POLICY (
object_schema      =>  'scott',
object_name        =>  'emp',
policy_name        =>  'mypolicy1',
audit_condition    =>  'WHERE CLAUSE IS ABSENT',
audit_column       =>  'comm,sal',
[code].......  

SELECT * FROM EMP;but queries with conditions ('WHERE sal > 400', for instance) are not trapped.

I'm using 11gR2 (11.2.0.2) on OEL.