What does the Security checks completion certificate involve?

Q:

What does the Security checks completion certificate involve?

A:

The security checks are carried out by each contractor and completion of the checks is certified in the form of a Security clearance certification. This clearance is based on satisfactory results of a background investigation which includes checks of criminal records from the home country, not older than six months, covering a minimum of the past five years. It checks of other evidence that would threat or reflect adversely upon that individual's trustworthiness and reliability.