Sexual harassment claims are difficult to handle, and it is wise to be sensitive to any allegations. Employers have an affirmative duty to take reasonable steps to prevent and promptly correct discriminatory and harassing conduct. Part of this duty includes conducting a fair, timely and thorough investigation into allegations of misconduct and taking appropriate action when needed.
An investigation is imperative, even when the allegations appear to be frivolous, or when the relationship appears to be consensual.
However, the extent of the investigation may vary. Not every situation is the same. Some situations are simple, and can be observed and responded to immediately. Others are more complex and involve greater risk of liability, harm to employees and/or disruption to business operations and will require a more formal, lengthy investigation.
Remember that planning is essential: A poorly planned investigation may expose both the organization and the investigator to liability.
You can find more information in the Harassment Investigations section of the HR Library.