18 U.S.C. § 1512 — Witness Tampering and Obstruction

This is the statute that turns an investigation you might have survived into a conviction you will not.

The conduct feels innocuous. Calling a co-worker to ask what they were asked. Suggesting a former employee "does not need to volunteer anything." Both are chargeable.

What the statute covers

18 U.S.C. § 1512 has several distinct prohibitions:

§ 1512(a) — killing or attempting to kill, or using physical force, to prevent testimony or reporting.
§ 1512(b) — using intimidation, threats, or corrupt persuasion, or engaging in misleading conduct, with intent to influence testimony, cause a person to withhold testimony or records, or hinder communication with law enforcement.
§ 1512(c) — corruptly altering, destroying, mutilating, or concealing a record with intent to impair its integrity or availability for use in an official proceeding, or otherwise obstructing, influencing, or impeding any official proceeding.
§ 1512(d) — intentionally harassing a person to hinder or dissuade them from participating.

"Corrupt persuasion" is the dangerous phrase

No violence is required. No explicit threat is required. Persuading someone to withhold information, with a corrupt purpose, is enough — and this is where ordinary people generate criminal exposure without intending to.

Conduct that has supported § 1512(b) charges: telling a witness they do not have to talk to agents in circumstances suggesting they should stay silent to protect you; offering something of value for silence or a favourable account; coaching a witness on what to say; asking someone to delete messages; and coordinating a story among people who will be interviewed separately.

There is a genuine line here. Truthfully advising someone they have a right not to speak to investigators is lawful — everyone does have that right. What crosses over is the corrupt purpose behind the advice, and the government infers purpose from the surrounding circumstances: your exposure, the timing, and what you said around it.

The § 1512(c)(2) catch-all

The "otherwise obstructs" language in § 1512(c)(2) is extremely broad on its face, and it has been the subject of significant litigation over how far it reaches beyond evidence impairment. Its scope has been narrowed by judicial interpretation, and the current boundaries matter to any case charged under it.

The practical point for a defendant: whether particular conduct falls within § 1512(c)(2) rather than merely looking obstructive is a legal question worth litigating, not something to concede.

The nexus requirement

Obstruction statutes are not violated by every act that inconveniences the government. The Supreme Court has required a nexus between the conduct and a particular proceeding.

In United States v. Aguilar, 515 U.S. 593 (1995), the Court held that the defendant must have known his actions were likely to affect a particular judicial proceeding. In Arthur Andersen LLP v. United States, 544 U.S. 696 (2005), it read "knowingly corruptly persuades" to require consciousness of wrongdoing, and emphasized that document retention policies are not inherently corrupt — a person may destroy documents for legitimate reasons.

Note that under § 1512(f) an official proceeding need not be pending or about to be instituted at the time of the conduct, which cuts the other way. The nexus requirement therefore does real work but does not require a filed case.

Penalties

They vary sharply by subsection. Killing or attempted killing under § 1512(a) carries up to life. Section 1512(b) carries up to 20 years. Section 1512(c) carries up to 20 years. Section 1512(d) harassment carries up to 3 years.

Sentencing runs through U.S.S.G. § 2J1.2, with substantial enhancements for causing or threatening physical injury and for property damage. An obstruction adjustment under § 3C1.1 may also apply to the underlying offense — and note the double-counting question that arises when both are applied.

The statutes charged alongside

§ 1519 — destruction of records in a federal investigation, with no pending-proceeding requirement at all.
§ 1519's neighbour § 1520 — audit record retention.
§ 1503 — the omnibus obstruction of justice provision, for judicial proceedings.
§ 1505 — obstruction of agency and congressional proceedings.
§ 1001 — false statements, which very frequently accompanies an obstruction count.
§ 371 — conspiracy, including conspiracy to obstruct.

Defenses

No corrupt intent. The central defense. Legitimate reasons for the conduct — routine document practices, genuine belief the material was irrelevant, advising someone of rights they actually have.

No nexus. That the defendant did not know the conduct was likely to affect a particular proceeding.

Truthful conduct. Encouraging a witness to tell the truth is not tampering, even where the truth helps you.

The statute charged. Whether the conduct fits the subsection alleged — particularly for § 1512(c)(2), where the reach of "otherwise obstructs" is contested.

The practical rule

Once you know of an investigation, do not contact potential witnesses about it at all — not to compare recollections, not to warn them, not to find out what they were asked. Route everything through counsel.

And preserve everything. The preservation duty attaches the moment you know, and prosecutors charge the cover-up in cases where the underlying conduct was never going to be provable. See our target letter guide.