If you are re-hiring an employee who has previously worked for your organisation, you will need to make sure they are properly onboarded to meet all security and compliance requirements. 

• Even if a person is rehired or someone who has previously worked for your company, it is important to onboard the employee as if they were new.
• Onboarding them as a "new" employee allows you to make sure all proper new hire checklist items have been completed when you are audited, but it also maintains the employee's previous onboarding and off-boarding information.