@rain dance maggie
As far as I know, the Security Clearance is a background process if you may say! So unless QR asks you to submit your criminal/violations record or provide a Good Conduct Certificate well before your DOJ, it should be more of a routine procedure! I think it also depends on which country you come from!
For the safety record, you should be able to obtain this from your previous employer I suppose (No accident/incident report).