Filtering out bad candidates are the best outcome, the absolute worst time-sink for everyone involved is getting a bad hire. In a past life, I joined an organization, and my cohort included a bonafide conman with no prior experience, or requisite skill. The man could talk himself into (or out of) anything. It took a surprisingly long time for the team to realize he was getting other team members to do his work for him in the guise of "needing help" (several weeks).