9.2 Individual rights, evidence rules & privileges

Constitutional Rights of the Accused

Three amendments to the U.S. Constitution protect individuals during fraud investigations and prosecutions. Critically, these protections restrain government action; a private-sector fraud examiner generally is not bound by them—though evidence gathered improperly can still be excluded if the examiner is acting as an agent of law enforcement.

The Fourth, Fifth, and Sixth Amendments

• Fourth Amendment — search and seizure. Protects people against unreasonable searches and seizures by the government. As a rule, law enforcement must obtain a warrant supported by probable cause that describes the place to be searched and the items to be seized. Recognized exceptions include consent, plain view, exigent circumstances, and searches incident to a lawful arrest. Evidence obtained in violation of the Fourth Amendment may be barred under the exclusionary rule and its "fruit of the poisonous tree" extension.
• Fifth Amendment — self-incrimination and due process. No person "shall be compelled in any criminal case to be a witness against himself"—the right to remain silent. The amendment also guarantees due process, protection against double jeopardy (being tried twice for the same offense), and a grand jury for federal felonies. The familiar Miranda warnings flow from this amendment. The privilege protects individuals, not corporations, and generally does not extend to pre-existing business records.
• Sixth Amendment — fair-trial protections. Guarantees the right to counsel, the right to a speedy and public trial, the right to confront (cross-examine) opposing witnesses, and the right to compulsory process to obtain favorable witnesses.

The Federal Rules of Evidence

In federal court—and in state courts with parallel rules—the Federal Rules of Evidence (FRE) govern what a jury may hear. Fraud examiners must understand them so that the evidence they collect will be admissible.

• Relevance (FRE 401–403). Evidence must be relevant: it must tend to make a fact of consequence more or less probable. Even relevant evidence may be excluded when its probative value is substantially outweighed by unfair prejudice, confusion of the issues, or waste of time.
• Authentication (FRE 901–902). Before an item is admitted, its proponent must show it is what it claims to be. Documents, emails, and records are authenticated through testimony, distinctive characteristics, or self-authenticating certifications. A well-documented chain of custody supports the authentication of physical and digital evidence.
• Hearsay (FRE 801–807). Hearsay is an out-of-court statement offered to prove the truth of the matter asserted. It is generally inadmissible because the declarant was not under oath and cannot be cross-examined. Numerous exceptions exist, however, including business records made in the regular course of business, present-sense impressions, excited utterances, statements against interest, and public records. The business-records exception is especially important in fraud cases, where financial documents are routinely offered this way.
• Best evidence rule (FRE 1001–1004). To prove the content of a writing, recording, or photograph, the original—or a reliable duplicate—is generally required.

Fraud examiners also distinguish direct evidence (which proves a fact without inference, such as an eyewitness account) from circumstantial evidence (which requires an inference, such as a pattern of altered invoices). Most fraud cases are built largely on circumstantial evidence, which is fully admissible and can be highly persuasive when the pieces form a consistent web.

Privileges

Certain communications are protected from disclosure even when they are relevant:

• Attorney-client privilege. Protects confidential communications between a client and attorney made to obtain or provide legal advice. It belongs to the client, who alone may waive it, and it covers communications rather than the underlying facts. It is lost if a third party is present or if the communication furthers a crime or fraud (the crime-fraud exception).
• Work-product doctrine. Protects materials prepared by or for an attorney in anticipation of litigation—an investigator's notes, memoranda, and analyses. It is broader than the privilege in some respects but can be overcome by a showing of substantial need.
• Spousal privileges. Two forms exist: the spousal testimonial privilege (a spouse cannot be forced to testify against the defendant spouse in a criminal case) and the marital communications privilege (confidential communications between spouses are protected). Both carry limits and exceptions.
• Accountant-client privilege. There is no general accountant-client privilege under federal common law. Some states recognize a limited statutory privilege, and a narrow federally authorized tax-practitioner privilege (IRC §7525) covers certain tax advice—but it does not apply in criminal matters or to tax-shelter communications. Examiners should never assume accountant communications are protected.

Quick Reference

Because these constraints bind government actors, private examiners retain flexibility—but they should work closely with counsel so their investigative product stays privileged and the evidence they gather remains admissible.