What could this bank implement to help make sure that this doesn’t happen in the case that Adam works at a bank where it is crucial that no unauthorized data leaves the network?

The technique of preventing unwanted data from leaving an organization is known as data loss prevention (DLP). Sensitive information can be purposefully or inadvertently disclosed. Whatever the reason, the consequences can be severe. DLP measures cannot completely prevent data loss, however, they may be used to limit the possibilities of data leaking whenever possible.