PS-3 Personnel Screening has two parts. Screen individuals before you authorize their access to the system, and rescreen them according to conditions you define. NIST 800-53 binds US federal systems, and reaches other organizations through contracts. For everyone else it is a reference, and a customer or auditor may still ask you to show this control.
What it means in practice
The control leaves the details to you. The NIST guidance says screening should reflect applicable laws, policies and the risk designation of each position. Examples it gives are background investigations and agency checks. It also says you may set different rescreening conditions and frequencies depending on the information a system handles.
For a private company that usually means a background check policy tied to role risk. An engineer with production access and a person with no system access do not need the same check. What matters is that the policy exists, is applied before access is granted, and says when rescreening happens.
The four enhancements in the record (PS-3.1 Classified Information, PS-3.2 Formal Indoctrination, PS-3.3 Information Requiring Special Protective Measures, PS-3.4 Citizenship Requirements) mostly matter for government and defense work. Skip them unless a contract names them.
Evidence to collect
- The screening policy, with role risk tiers and the check required for each tier.
- A list of current staff and contractors with the date screening was completed and the date of the next rescreen, if one applies.
- Proof that screening finished before the first access grant, for example the check completion date next to the account creation date.
- The vendor or process used for checks, and any records you are allowed to keep.
- Your rescreening triggers, such as a move into a more sensitive role.
Common gaps
- Screening happens, but nobody can show it happened before access was granted.
- Contractors are screened by their agency and you hold no confirmation.
- The policy says rescreen "periodically" and never names a trigger or interval.
- Privacy law limits what you may store, and the team keeps either too much or nothing.
How to implement it
Write down the position tiers first. Tie each tier to a check type. Add a gate in onboarding so the access request cannot be approved until HR marks the check complete. Record the completion date in the HR system, and review the list twice a year for rescreen triggers. Check local employment law before you set the check scope.
Quick check
Does PS-3 require a specific background check?
No. It requires screening before access and rescreening under conditions you define. The kind and depth of check follow your risk designations and applicable law.
