Your brittle plastics policy as per previous posts should be based on risk.
For low risk areas such as offices it may be that you can carry out an annual check and any breakages managed by a breakage policy and procedure.
For product areas, regular inspections of registered items are normal. For open product areas the first policy should be to exclude, secondly high risk items should be adequately protected from damage and if there a risk of a breakage causing brittle material to fall* into product then checks before starting and at the end of the production shift/day. Other brittle items in the area should also be checked at an appropriate frequency such as weekly/monthly based on the risk.
* In the case of these type of breakages strict controls should be in place to clean up, control of cleaning equipment, disposal of debris, quarantine product, supervision, training and authorization to recommence operations.