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Occasionally the new heart may have an abnormally slow rhythm , and a pacemaker may be required . On the basis of these reports , a driver may be required to re-take the driver licensing tests ( vision , knowledge and drive ) and demonstrate their ability to safely operate a motor vehicle . A candidate for a degree may be required to make a satisfactory standing on a departmental comprehensive examination , or write an acceptable essay on some aspect of his / her major subject . A witness may be required to attend an examination only in the county wherein he resides or is employed , or transacts his business in person , or is served with a subpena , or within forty miles of the place of service . Location changes will be handled on a case by case basis : a form may be required to complete the location change .