Thank you for your question! Unfortunately the only way to block access to the guest user account completely is to set someone else up as the Mac Admin. That way the Guest profile can be turned off with and you do not have access to turn it back on. The good news is that Covenant Eyes is able to monitor the activity on the Guest User account as well! If you have any further questions or need assistance feel free to give us a call at 877.479.1119.