This agreement contains a covenant not to compete after the employee leaves the company. Restrictions to prevent competition by a present or former employee are held valid when they are reasonable and necessary to protect the interests of the employer. For example, a provision in an employment contract which prohibited an employee for two years from calling on any customer of the employer called on by the employee during the last six months of employment would generally be valid. Courts will closely examine covenants not to compete signed by individuals in order to make sure that they are not unreasonable as to time or geographical area.