You can only suspend an employee when you have clearly given yourself that right via your employment agreements. While difficult to establish, you may also be able to rely on past practice to show that you have the right to suspend employees even without an agreement – if so, we recommend you consult an HR lawyer to confirm whether this is indeed the case.
We always advise our employer clients to avoid using the term suspension, and to use the term administrative leave instead.
If you operate with unionized employees, it is common for the collective agreement to give employers the right to suspend employees on various grounds.