Ill. Admin. Code tit. 56, § 300.870
An employer may request that a deposit be paid on a particular piece of property, but such a deposit shall not be deducted from the employee's wages or final compensation unless the employee's express written consent is given freely at the time the deduction is made.
(Source: Added at 16 Ill. Reg. 13828, effective September 1, 1992)