For more serious findings, your Remediation Standards can ask for actions to be verified: someone other than the owner confirms the work was done.
How it works
The owner marks the action Done. It becomes Awaiting verification.
A verifier reviews it: the completion note, the evidence, the photos.
They choose Verify, or Send back with a reason (the action goes back to the owner).

Good to know
Verifying needs its own permission. Things to verify show on your Calendar and the Findings Dashboard.
Verifying your own action is allowed but recorded.
Whether verification is needed is decided when the action is raised, and checked again when it's marked done, using the standards in force then.