Many people are hired prior to the background check information arriving back. When we hire, the drug and alcohol check must be reported back before hire, however, the full all out background check is not initiated until the applicant has been offered and accepted the position. By the time you arrange training, indoctrination, etc..your preliminary report is done, and hopefully you will have the complete by first trip. The candidates understand that all things are subject to the checks. We had one in school before we came upon the fact they had failed to mention they were convicted sex offender.