Definition
Diversion has two distinct legal meanings that operate in almost entirely separate bodies of law and should not be confused.
1. Water Law. The unauthorized or legally significant alteration of a watercourse from its natural channel, typically to the detriment of a downstream or riparian proprietor. At common law, a landowner had no right to redirect a natural stream in a manner that deprived a lower proprietor of water flow. Diversion in this sense is a tortious act sounding in nuisance or riparian rights, actionable by abatement, injunction, or damages.
2. Criminal Procedure. A disposition mechanism by which a criminal defendant is redirected out of the traditional prosecution pathway — either before charges are filed, after charges are filed but before trial, or after conviction — into a structured program that, upon successful completion, results in dismissal of charges, avoidance of a conviction record, or reduced consequences. Diversion programs typically involve conditions such as drug treatment, community service, counseling, education, or supervision. Diversion is not acquittal and not dismissal on the merits; it is a conditional alternative to prosecution.
Common Language
Modern common usage (Wiktionary): A tactic to draw attention away from a real action; a hobby or activity that relaxes the mind; the act of rerouting cargo, passengers, water, or traffic; a detour.
Historical common usage (Webster's 1913): "The act of turning aside from any course, occupation, or object"; also "that which diverts" the mind from care, providing amusement or sport.
The ordinary meaning of diversion captures turning aside or distraction — and both legal meanings share that root sense. But a researcher encountering "diversion" in a legal source must immediately determine which body of law governs. In pre-twentieth-century legal texts, diversion almost exclusively means watercourse interference. In modern criminal law sources, it almost exclusively means a prosecutorial or judicial alternative to conviction. A researcher who reads one into the other will fundamentally misread the source.
Common Confusion
Diversion (criminal) vs. Deferred Prosecution vs. Deferred Adjudication: These terms are often used interchangeably in practice but are technically distinct. Deferred prosecution means the prosecutor agrees to hold charges in abeyance pending program completion; no formal court proceeding is commenced. Deferred adjudication means charges have been filed and the defendant has entered a plea, but sentencing or judgment is postponed pending program conditions. Diversion is the broader umbrella concept that may encompass either, depending on jurisdiction. Some jurisdictions use "diversion" to describe only pre-charge programs; others use it for the full spectrum. Always verify the procedural stage when the term appears in a specific jurisdiction's statutes or rules.
Diversion (water law) vs. Appropriation: Diversion in the riparian rights context is not the same as lawful appropriation of water under prior appropriation doctrine. In prior appropriation states, a permitted diversion is a legally sanctioned right. The same physical act — redirecting water — is a tort in a riparian jurisdiction and a vested property right in an appropriation jurisdiction. Context and jurisdiction are dispositive.
Recognized Forms
/SUBTYPES
Criminal Diversion:
— Pre-arrest diversion: Law enforcement declines to arrest and redirects the individual, typically used in mental health or substance abuse encounters.
— Pre-charge diversion: Prosecutor declines to file charges contingent on program completion; if conditions are met, no charges are ever brought.
— Post-charge / pre-adjudication diversion: Charges are filed but proceedings are suspended; successful completion results in dismissal.
— Post-adjudication diversion: Conviction or plea enters, but sentence is diverted to a program; completion may result in expungement or reduced record consequences.
— Specialty court diversion: Drug courts, mental health courts, and veterans' courts operate as structured diversion tracks with judicial oversight.
Water Law Diversion:
— Riparian diversion: Unauthorized rerouting of a stream to the prejudice of a lower proprietor; actionable at common law.
— Appropriative diversion: Lawful taking of water under a permit in prior appropriation jurisdictions.
Why It Matters in Research
The primary research trap with diversion is the temporal and subject-matter bifurcation. Historical legal dictionaries — including all sources on the Law Mind shelf — define diversion exclusively in the water law sense. A researcher using Black's 1st or 2nd Edition, Bouvier's, or Anderson's to understand "diversion" will find no reference to criminal procedure whatsoever. The criminal law meaning is a twentieth-century development that accelerated dramatically in the 1970s alongside the rise of problem-solving courts and is not reflected in any of the historical dictionary sources.
For water law research: The historical sources are genuinely useful. Bouvier's and Black's both clarify that the prejudice to the lower proprietor is the operative harm, not the act of diversion alone. Bouvier's note about nitroglycerin and natural gas wells — drawing gas from a neighbor's land — hints at the expanding application of diversion principles to subsurface resource interference, a doctrinal extension worth tracing in nineteenth-century state cases.
For criminal procedure research: Do not consult historical dictionaries. Go directly to the encyclopedia entries (criminal_87, criminal_252), jurisdiction-specific diversion statutes, and prosecutorial policy materials. The term's meaning, conditions, eligibility criteria, and consequences vary substantially by state and even by county.
The diversity jurisdiction encyclopedia entry (civpro_3) is a false cognate — diversity jurisdiction shares the root word but has no doctrinal connection to diversion. Do not follow that thread for diversion research.
Researchers in juvenile law should note that diversion has deep roots in juvenile justice, where the policy rationale (avoiding the stigma of formal adjudication) predates its widespread adoption in adult criminal courts. Juvenile diversion materials may be indexed separately from adult criminal diversion in both primary and secondary sources.
Historical Dictionary Support
All six shelf sources treat diversion as a water law term, and five of the six are functionally identical in their definitions — tracking the same core formulation: a turning aside or altering the natural course of a watercourse to the prejudice of a lower proprietor. Black's 1st and 2nd Editions, Bouvier's, and Anderson's are in agreement on this. Burrill's entry is the most compressed, simply noting the Latin root (diversio, from divertere) and cross-referencing Divert — of limited independent value.
Rapalje & Lawrence's entry as captured in the source material appears to have been pulled from the wrong headword, discussing distringas and sequestration rather than diversion; this reflects either a digitization or indexing error in the corpus and should not be relied upon for diversion doctrine.
The historical sources collectively omit: (1) the prior appropriation doctrine distinction, which became critical in western U.S. water law development through the nineteenth century; (2) any criminal procedure meaning; and (3) modern statutory and regulatory frameworks governing water diversion permits. What the sources capture well is the common law riparian injury framework, which remains the baseline for understanding the term's doctrinal origins.
Jurisdictional Note
Water law diversion doctrine diverges sharply between riparian rights states (generally eastern U.S.) and prior appropriation states (generally western U.S.). In riparian states, unauthorized diversion is tortious; in prior appropriation states, permitted diversion is a property right, and the tort is interference with another's prior appropriation. Criminal diversion programs vary by state statute, and eligibility criteria — offense type, criminal history, age — differ significantly across jurisdictions. Federal diversion programs exist but are narrower in scope than state counterparts.
Encyclopedia Cross-Reference
Drug Courts and Diversion Programs — criminal_87, The Law Mind Criminal Law Encyclopedia
School-to-Prison Pipeline and Diversion Programs — criminal_252, The Law Mind Criminal Law Encyclopedia