A guard can't clock in on an expired licence.
Licences expire quietly, and posts still need covering. CrewOS checks the guard's licence is current before they clock in, so a lapsed one stops the shift instead of surfacing in an audit.

A guard gets scheduled for a post they are not licensed to work.
The licence lapsed last month, or it was never the right class for that account, and nobody caught it. The guard shows up, clocks in, and works the patrol. On paper everything looks fine, right up until it does not.
You usually find out when the client's auditor does.
An expired licence on a covered post can mean regulatory exposure, an emergency replacement at the worst possible hour, and an account that starts asking what else you are not checking. The cost is rarely the fine. It is the contract.

The clock-in gate is yours to set, document by document.
You decide what gets checked, on which jobs, and how hard the system holds the line.

The licence is tied to the post, and checked before the clock-in.
- 1You mark a licence as required for clock-in on the posts that need it, per document type, in the compliance catalogue.
- 2CrewOS tracks each guard's licence and counts down to its expiry, so a lapse is visible before it happens, not after.
- 3At the post, an expired or missing required licence can't satisfy the shift, so the guard can't clock in. The gate is the backstop, and it doesn't rely on anyone remembering.
See it happen.

Can CrewOS stop a guard with an expired licence from clocking in?
Yes, where that licence is set as required for clock-in. CrewOS checks the assigned document is current before the guard can clock into a shift that requires it. An expired or missing licence is not current, so the clock-in is blocked until it is renewed.
The requirement is set per document type in the compliance catalogue, and it reads from the licence's own expiry date. A licence that lapses overnight blocks the next clock-in without anyone re-checking.
Nobody works a post they are not cleared for.
The check runs every time, not only when someone remembers it. Your guards stay eligible, your accounts stay covered, and the thing you can least afford to get wrong stops riding on memory.