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# evaluatedPolicyDomainState

The current state of the evaluated policy domain.

```
var evaluatedPolicyDomainState: Data? { get }
```

## Discussion

The value of this property is non-`nil` when the [`canEvaluatePolicy(_:error:)`](/documentation/LocalAuthentication/LAContext/canEvaluatePolicy(_:error:)) method succeeds for a biometric policy or the person successfully authenticates using biometrics, following a call to [`evaluatePolicy(_:localizedReason:reply:)`](/documentation/LocalAuthentication/LAContext/evaluatePolicy(_:localizedReason:reply:)). Otherwise, its value is `nil`.

Compare the values you get from successive calls to this property to determine whether the authorized database changed. However, the value you get doesn’t describe the nature of a change; it only lets you detect if a change happens.

> Note:
> The value of this property is different in different processes, so you can’t compare the value from one app to the value from another app.

---

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