Final answer:
Sarah is named in the legal suit due to her delegatory responsibility and potential supervisory liability, as she was responsible for ensuring Leslie was competent to safely perform the delegated task.
Step-by-step explanation:
Sarah is named in the suit because as the delegator, she is responsible for ensuring that Leslie, the delegatee, is carrying out tasks appropriately, particularly when these tasks are within the scope of patient care. In legal terms, this responsibility is often referred to as delegatory responsibility or supervisory liability. Sarah's role involves evaluating the competencies of Leslie to ensure she is capable of performing the delegated tasks without endangering patients. If an injury occurs due to the delegated task being performed improperly, both the delegatee who performed the task and the delegator who assigned it could be held liable under the concept of vicarious liability. Healthcare professionals must adhere to established standards of care, and failure to do so, as in the case where improper technique results in patient harm, can lead to legal actions.