Is it permissible for an employer to deduct late-arrival penalties from salaries without prior notification of the re-activation of the deduction clause, and must they return these amounts, and what if they are not returned?

The company's failure to deduct for tardiness from employees' salaries during a certain period does not waive its right to deduct thereafter, whether the non-deduction was intentional or resulted from error or oversight. The company is not obligated to notify employees of the deduction system for tardiness, as they are aware of it from the original contract. Any negligence, in this case, lies with the employees for not submitting permission requests.