This is an important question and often overlooked when hiring.  Sure you may get a muffled answer after an interview, but what do they really think?  Hirewall allows anonymous commenting against a candidate.  Your employees can comment about a candidate and not fear repercussions.  

Why is this important?  One of the most likely reasons your employees have left work early is team acceptance and personality clashes.

By building a conversation around a candidate, its a win-win situation for you, your employees and the candidate.