Please discuss some the issues that are related to the failure of an employer to adequately do a proper background check of a future employee.

If you were an employer, what would be your biggest concern in failing to do a sufficient background check?

What information would you look into and how would you go about it$?$

Also, if you were a prospective candidate for a job, what issues would you be concerned about if an employer was conducting an extensive background check and why?