BS 7858 screening, walked through stage by stage

BS 7858 is usually handed to a new starter as a list of documents to produce. It makes more sense read as a sequence: each stage is there because the previous one, on its own, leaves a specific question unanswered. The exact requirements sit in the current published version of the standard, and this is a walkthrough of the shape of it rather than a substitute for reading it.

Identity, before anything else

Screening starts by establishing that the person in front of you is who they say they are, using acceptable identity documents. Everything that follows — employment history, references, right to work — is only meaningful if it is attached to a verified identity rather than a name on an application form.

The stages in rough order

• –Identity verification, using acceptable documentary evidence
• –Right to work confirmation — see right to work checks for security contractors
• –Employment and activity history covering the period the standard specifies, with gaps identified and explained
• –Verification of the most recent employment or activity directly with the employer, where that applies
• –Character references from individuals able to comment on the applicant's conduct
• –Any criminal record or financial checks that apply to the specific role and contract

The order matters less than the fact that each stage narrows the picture. Identity confirms who. Right to work confirms they can legally be employed. History and references confirm what they have actually been doing and how they have conducted themselves while doing it.

Where it stops being a checklist

The part that turns screening from a form-filling exercise into an actual assessment is the employment history stage, because it is the one most likely to surface something that needs a judgement call — an unexplained gap, an employer who will not respond, a reference that arrives thin or reluctant. See explaining gaps in employment history for how that specific stage is normally handled.

None of the stages are optional extras layered onto a core check. They are each closing a different failure mode, and skipping one because a candidate is needed urgently on site reopens exactly the gap that stage exists to close.

Applying it consistently

The standard applies the same way to every applicant screened under it — there is no shortcut for someone who comes recommended, or who previously held a role elsewhere in the sector. A screening file that looks thin because the candidate was well known to the business is exactly the file that will not hold up if it is the one an assessor picks.

The stage that stalls

Screening rarely fails outright. It stalls, usually at employment history verification, because it depends on third parties responding — former employers who have been acquired, gone out of business, or simply do not reply. The file sits incomplete, the officer is needed on a contract, and pressure builds to start them while it is finished off.

That decision is the one worth having a policy for in advance, because it will otherwise be made case by case under operational pressure, by whoever is under it.

Keeping the trail while chasing

A stalled screening is far more defensible when the chasing itself is documented: who was contacted, when, by what method, and what response came back. A file showing four dated attempts at a former employer is a different document from one showing a gap, even though both are incomplete.

Common mistakes

• –No policy on whether an officer may start before screening completes
• –Chasing third parties without logging the attempts
• –Leaving stalled files without a review date
• –No escalation when a stage has been outstanding for weeks
• –Treating an unresponsive employer as a closed gap rather than a documented one
• –Starting an officer informally with no record of who authorised it

One practical test: find your oldest stalled file

Look for the screening file that has been incomplete longest, and find out how long it has been sitting there and whether anybody is still chasing it.

Screening rarely fails outright; it stalls, usually at employment verification, waiting on third parties who have been acquired, closed or simply do not reply. Files without a review date sit indefinitely, and the officer is frequently working throughout — which is the decision worth having a policy about in advance.

• –Give every incomplete file a review date and an owner
• –Log every chase attempt, so a gap is documented rather than blank
• –Decide in advance whether an officer may start before completion
• –Escalate when a stage has been outstanding for weeks
• –Record who authorised any exception, and why