If leave is not approved in advance, it should be reviewed for approval or disapproval as soon as reasonably possible after taken.
Leaves will not be approved in any situation; they are simply not a part of our workforce. 
mnli hypothesis: Leaves will not be approved in any situation; they are simply not a part of our workforce.  premise: If leave is not approved in advance, it should be reviewed for approval or disapproval as soon as reasonably possible after taken.