Checking on a person's credit history can be helpful since with this you can find if the person has a history of bankruptcy, so hiring this person and letting him/her deals with the company's funds is risky.
Background check can help you determine if the information that the applicant has given you or the details written on the person's resume are all true or lies.
With this, you can find the previous employers of the applicant.
You can also verify if the credentials that he/she showed you are true.
Falsified resume seems to be attractive and alluring but as soon as you find the truth behind all of these, you can prove that the person you are dealing with is a dangerous person.
  In conducting criminal background check, you have to also look if the person is not into drugs, since an addict employee tends to be reckless, drowsy, and not interested in the work.
A company can't afford to have employees like this.
You can look into the person's sex offender records as well, to make sure of the safety of your other employees.
  There are plenty of paid search services that you can find on the internet, these websites can provide you with accurate information within few minutes, so if you are conducting criminal background check at the initial interview of your applicant, you can easily do the searching, all you need is a computer with internet connection, viola, you will gain all the information you need about your applicant.