> the relative of the killer never agreed to share the data with the police Not with the police, but they let people who find a related DNA to find them (this

> the relative of the killer never agreed to share the data with the police Not with the police, but they let people who find a related DNA to find them (this is a feature of these websites). Once the police have your DNA, then can find your relatives. You can't control whether your relatives are opted in to this feature or not.