Restrictions on employment of participant.

An employer shall not employ a participant in a position: 1. That is the same or substantially equivalent to a position within the same organizational unit which was vacated by an employee who was laid off with the right to be recalled to work; 2. That is the same or substantially equivalent to a position within the same organizational unit for which the employer has caused an involuntary reduction in the hours of work of an employee to less than full time; 3. For which a vacancy was created by the employer terminating the employment of an employee for the purpose of hiring a participant; or 4. For which an involuntary reduction in the work force of the employer was caused for the purpose of hiring a participant.