Criminal tampering is the unauthorized alteration, damage, destruction, or interference with someone else’s property, a consumer product, a record, a computer system, or a legal proceeding. It is prosecuted under both state and federal law, and penalties range from a few days in jail for minor interference to life imprisonment when consumer product tampering causes a death. States typically grade the offense by degree based on what was tampered with and how much harm resulted; federal law uses separate statutes for each category of tampering, each with its own penalty structure.
What Counts as Tampering
The conduct that qualifies as tampering varies by statute, but the core idea is consistent: someone without authorization interferes with, alters, damages, or destroys something that belongs to another person or serves a public function. The protected categories are the ones society depends on to function — utility infrastructure, consumer products, evidence in legal proceedings, computer systems, mail, and election processes.
Some tampering is handled at the state level. Interfering with a gas, electric, or water meter is a common example. People bypass equipment or install devices to reduce their recorded usage, and states prosecute these cases under their own criminal codes. Other tampering triggers federal prosecution because it involves federally regulated products, government property, court proceedings, or interstate computer systems. The federal statutes are grouped below by what they protect.
Federal Tampering Offenses and Penalties
Federal law addresses tampering through several distinct statutes. Penalties are generally harsher than most state-level tampering charges, particularly where the conduct threatens public safety or obstructs a government function.
Consumer Product Tampering
Tampering with consumer products that move through interstate commerce is a federal crime under 18 U.S.C. § 1365. The statute covers food, drugs, cosmetics, medical devices, and household products, and it reaches the product itself, its labeling, or its container.
Penalties scale with the harm caused:
- No resulting injury: up to 10 years in prison
- Serious bodily injury: up to 20 years in prison
- Death: any term of years up to life imprisonment
- Attempt alone: up to 10 years in prison
Conduct short of actual tampering also carries penalties. Communicating false information that a product has been tainted is punishable by up to five years, and threatening to tamper carries the same five-year maximum. Inserting unauthorized writings or materials into a product without the manufacturer’s or retailer’s consent is a lesser offense, with up to one year for a first violation and up to three years for a repeat.1Office of the Law Revision Counsel. 18 USC 1365 – Tampering with Consumer Products
Evidence and Records Tampering
Destroying or falsifying records connected to a federal investigation is one of the more commonly prosecuted tampering offenses. Under 18 U.S.C. § 1519, anyone who alters, destroys, conceals, or falsifies any record, document, or tangible object with intent to obstruct a federal investigation faces up to 20 years in prison. The statute reaches any matter within the jurisdiction of a federal department or agency, plus bankruptcy proceedings. Shredding financial records during an audit, deleting emails relevant to a regulatory inquiry, or altering a lab sample ahead of a federal inspection all fall within it.
No formal proceeding needs to be underway. The statute applies to conduct “in relation to or contemplation of” a federal matter, so someone who destroys documents because they anticipate an investigation can be charged even before a subpoena issues.2Office of the Law Revision Counsel. 18 USC 1519 – Destruction, Alteration, or Falsification of Records in Federal Investigations and Bankruptcy
Witness Tampering
Interfering with witnesses, victims, or informants in federal proceedings carries some of the harshest penalties in this area. Under 18 U.S.C. § 1512, the conduct ranges from outright violence to subtler forms of pressure like corrupt persuasion or misleading statements. The tiers:
- Using physical force: up to 30 years in prison; threats of physical force: up to 20 years
- Intimidation or corrupt persuasion to influence testimony, withhold evidence, or prevent communication with law enforcement: up to 20 years
- Destroying or concealing documents or objects to impair their use in an official proceeding: up to 20 years
- Harassment that hinders someone from reporting a federal offense or attending a proceeding: up to 3 years
Conspiracy to commit any of these offenses carries the same penalties as the underlying act.3Office of the Law Revision Counsel. 18 USC 1512 – Tampering with a Witness, Victim, or an Informant If a witness is killed, the case moves to the federal murder statutes and can result in a life sentence.
Computer and Digital Tampering
Federal computer tampering falls under 18 U.S.C. § 1030, which covers unauthorized access to and damage of “protected computers.” That category includes computers used by financial institutions, the federal government, and any system involved in interstate commerce. In practice, it reaches nearly every computer connected to the internet.
Accessing a protected computer to commit fraud and obtaining something worth more than $5,000 in a year carries up to five years. Causing damage with losses of at least $5,000, or damage affecting medical care, public safety, or government systems used for national defense or justice, also carries up to five years for a first offense. Repeat offenses push maximums to 10 or 20 years depending on the specific violation. The statute defines “damage” broadly to include any impairment to data integrity, system availability, or information accessibility, so altering a database record or changing access permissions without authorization can trigger prosecution once the loss threshold is crossed.4Office of the Law Revision Counsel. 18 USC 1030 – Fraud and Related Activity in Connection with Computers
Infrastructure, Mail, and Elections
Tampering with communication lines or systems operated or used by the federal government, including systems designated for military or civil defense functions, carries up to 10 years under 18 U.S.C. § 1362.5Office of the Law Revision Counsel. 18 USC 1362 – Communication Lines, Stations, or Systems Damaging an energy facility that produces, stores, transmits, or distributes electricity or fuel carries up to 20 years if the damage exceeds $100,000 or causes a significant service interruption, and up to five years if the damage exceeds $5,000. A resulting death can extend the sentence to life.6Office of the Law Revision Counsel. 18 USC 1366 – Destruction of an Energy Facility Damaging federal government property carries up to 10 years if the damage exceeds $1,000, or up to one year if it does not.7Office of the Law Revision Counsel. 18 USC 1361 – Government Property or Contracts
Stealing, destroying, or removing contents from mail is a federal offense under 18 U.S.C. § 1708 with penalties up to five years.8Office of the Law Revision Counsel. 18 USC 1708 – Theft or Receipt of Stolen Mail Matter Generally A separate provision, 18 U.S.C. § 1705, makes it a crime to damage mailboxes or injure mail deposited in them, with up to three years in prison and fines up to $250,000. Opening someone else’s package or damaging a neighborhood mailbox can produce a federal felony charge.
Tampering with voter registration records or election materials in a federal election is punishable under 52 U.S.C. § 20511 by up to five years. The statute covers submitting voter registration applications known to be false or fraudulent, casting or tabulating fraudulent ballots, and intimidating or coercing anyone in connection with registering to vote or voting.9Office of the Law Revision Counsel. 52 USC 20511 – Criminal Penalties
How States Grade Tampering by Degree
Most states organize tampering offenses into degrees, with lower degrees covering less harmful interference and higher degrees reserved for conduct that disrupts essential services or endangers the public. The exact structure varies, but the pattern is consistent.
Third-degree or lower-level tampering is typically a misdemeanor. It covers interference with another person’s property, intended to cause inconvenience or minor disruption rather than serious harm — altering a neighbor’s fence, disconnecting a security camera. Penalties generally run to up to one year in jail, modest fines, and probation or community service.
Second-degree tampering usually involves interference with utility infrastructure: gas, electric, water, sewer, or telecommunications systems. Unauthorized connections to a utility line and meter tampering typically fall here. Depending on the state, second-degree tampering may be classified as a misdemeanor or a low-level felony.
First-degree tampering is the most serious state-level charge and typically requires both intent to cause a substantial interruption of public service and actual disruption. Disabling part of an electrical grid or damaging equipment at a water treatment facility is the kind of conduct that fits. These are felonies, and prison sentences in most states run from one to several years depending on the sentencing structure and the defendant’s criminal history.
Utility meter tampering is exclusively a state-level offense; there is no federal statute specifically covering it. States handle it under general tampering statutes or dedicated utility fraud provisions. Many states allow the affected utility company to pursue civil recovery on top of the criminal case, and some authorize treble damages.
What a Prosecutor Has to Prove
Every tampering prosecution requires the government to prove two things: a physical act of interference, and the required mental state.
The physical act is straightforward. Some unauthorized alteration, damage, destruction, or interference with property, a record, a product, or a system. Moving a surveyor’s stake, cutting a wire, deleting a file, breaking a seal on a medicine bottle — any deliberate action that changes the condition or function of the targeted thing qualifies.
The mental state is where cases are won and lost. Most statutes require that the defendant acted “knowingly” or “intentionally,” meaning the person was aware of what they were doing and meant to do it. Some federal statutes set the bar differently. Consumer product tampering under § 1365 requires “reckless disregard” for the risk of death or bodily injury, a lower threshold than intent but still demanding proof of conscious indifference to a serious danger.1Office of the Law Revision Counsel. 18 USC 1365 – Tampering with Consumer Products Evidence tampering under § 1519 requires “intent to impede, obstruct, or influence” a federal matter — the prosecution must show a purpose beyond carelessness.2Office of the Law Revision Counsel. 18 USC 1519 – Destruction, Alteration, or Falsification of Records in Federal Investigations and Bankruptcy If the alteration happened by accident, through ignorance, or because the person genuinely believed they had authorization, the mental state element may not be satisfied.
Common Defenses
Successful tampering defenses usually target the mental state rather than denying the physical act. The interference is often not disputed; what matters is whether the defendant had the required intent or knowledge.
Lack of intent is the most straightforward. If the alteration was accidental or the result of a misunderstanding, the prosecution may be unable to prove the defendant acted knowingly. Someone who inadvertently disconnects a utility connection during authorized construction work did not intend to tamper with anything.
Authorization or belief of right applies when the defendant had permission, or reasonably believed they had permission, to interact with the property. Many state tampering statutes explicitly require that the person acted “having no right to do so nor any reasonable ground to believe” they had such a right. A colorable basis for believing authorization existed can defeat the charge on this element alone.
Lawful conduct is a statutory affirmative defense in certain federal cases. For witness tampering under § 1512, the defendant can prevail by proving that their conduct was lawful and their sole intention was to encourage truthful testimony. The defendant carries the burden of proving this defense by a preponderance of the evidence.3Office of the Law Revision Counsel. 18 USC 1512 – Tampering with a Witness, Victim, or an Informant
Challenging the government’s evidence chain also matters, particularly in cases involving shared access to property, records, or computer systems. If prosecutors cannot prove who made the alteration, reasonable doubt may be enough for acquittal.
Consequences Beyond the Criminal Sentence
A tampering conviction creates problems well beyond the sentence a judge imposes. Felony convictions affect employment prospects, voting rights in some states, and eligibility for federal benefits. Tampering convictions carry additional collateral consequences on top of those.
Professional licensing boards across the country treat tampering as a “directly related” offense for many licensed occupations. Accountants, real estate appraisers, engineers, funeral directors, and auctioneers are among the professionals who may face license denial or revocation after a tampering conviction, particularly one involving records, public documents, or fabricated evidence. The conviction does not always result in automatic denial, but it triggers a formal review that forces the applicant to demonstrate rehabilitation.
Civil liability often follows criminal charges. Utility companies can sue for the cost of investigating and repairing the tampering, and many states authorize damages well above the actual loss. A person convicted of meter tampering may pay criminal fines, restitution, and then face a separate civil judgment for triple the utility’s actual damages. These civil cases proceed independently from the criminal prosecution, so an acquittal on criminal charges does not necessarily prevent civil recovery.
Courts in criminal cases also routinely order restitution for the actual cost of repairing or replacing tampered property. For infrastructure tampering, those costs can be enormous. Replacing a damaged utility meter is a few hundred dollars; restoring service after someone damages a power substation can run into six figures. Restitution is not dischargeable in bankruptcy, so the obligation follows the defendant for years after the criminal case closes.