In what circumstance is it appropriate to continue an investigation without informing law enforcement?

Continuing an investigation without informing law enforcement is generally not appropriate under most circumstances. Informed consent and collaboration with law enforcement are essential aspects of many investigations, particularly those that may involve criminal activity or potential harm to individuals or property. Law enforcement is typically equipped to handle legal procedures and ensure that investigations adhere to the law, which helps protect the rights of all parties involved.

If an investigation relates to an incident that potentially involves criminal acts, failing to notify the authorities can lead to significant legal repercussions and may impede justice. Moreover, maintaining transparency throughout the investigation process helps establish credibility and integrity in the findings.

The other options may suggest scenarios where a private investigation could continue without police involvement, but they don't take into account the legal and ethical ramifications that may arise from not involving law enforcement when necessary, such as in cases of criminal offenses or safety concerns. Being authorized by an employer or working privately does not alleviate the obligation to inform law enforcement when the situation warrants it.