The section of the employee handbook that covers company rules and the violations that might lead to disciplinary action or termination is a tricky area. While you want to let employees know what actions will not be tolerated, you can't possibly hope to cover all of the various infractions that might be cause for discipline or dismissal. This list is not meant to be all-inclusive.
Management reserves the right to terminate employees for any reason, at any time.
As well, many companies outline in their handbooks the steps they will take when dealing with rule infractions or other disciplinary issues. This is another area where caution should be exercised. By no means do you want to give the impression that you will follow a strict path from verbal warning through written warning to dismissal in every situation. However, if disciplinary action is taken, it is the company's intent that the discipline will serve to correct employee behavior rather than to serve solely as a penalty for a past offense. None of these disciplinary measures is required to be used before termination from employment occurs, nor are the listed actions required to be used in any specific order.