How does confidential information from a former client create a conflict of interest?

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illustration from Charles Dickens's Bleak House — Legal ethics Illustration by Hablot Knight Browne for Charles Dickens's *Bleak House*. Here Lady Dedlock is visited by her cunning old lawyer, who discovers her deepest secret and threatens to reveal it to her husband.

In the context of legal ethics, a conflict of interest arises regarding a former client when a lawyer accepts new employment that involves the use, the appearance of use, or the potential use of confidential information obtained during the prior representation.1

This prohibition is rooted in the fundamental ethical duty of loyalty and the necessity of protecting client confidences. Because a lawyer is privy to sensitive information while representing a client, using that knowledge to benefit a new client—or even creating the appearance that such information could be used—undermines the integrity of the legal profession and the trust essential to the attorney-client relationship.1

Ethically, a lawyer must prioritize the sanctity of this information, as it would be inherently unfair and a breach of professional duty to leverage a former client's secrets against them. While some conflicts may be waived if a client provides informed consent, this is not absolute; if the public interest is adversely affected, the representation remains forbidden regardless of consent.1