Before you can interview effectively, you must know exactly what you are seeking, prioritize its importance, and ensure you are objective as possible in the process.
You need to ask questions about skills needed for specific jobs, but you should also be asking questions about skills that are difficult to train for (such as self-awareness, social skills, stress tolerance, or motivation).
This document provides 116 behavioral interview questions to assess 10 EQ competencies for any potential candidate.