Technicians Adding Tasks to Approved Tickets

Technicians Adding Tasks to Approved Tickets

Is there a way to stop a technician from adding tasks to tickets that are not assigned to them? Issue is that once a ticket is approved, tasks are being added after the approval for access that has not been approved.  This has happened twice this week and business rules are not working and I do not see the option under Roles unless I take all access away to create a task. 
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