Idaho criminal law is codified in the Idaho Criminal Code (Idaho Code §§ 18-101 et seq.) — a comprehensive statutory framework defining felonies and misdemeanors with specific penalty ranges. Idaho uses a category-based felony classification: felonies are punishable by imprisonment in the state penitentiary (Idaho Code § 18-105), while misdemeanors are punishable by imprisonment in the county jail. Idaho does not use a numbered felony severity grid like Kansas (which uses Severity Levels 1-10) or a lettered classification like Arkansas (Classes A through Y). Instead, Idaho specifies the penalty range within each individual crime's statute — for example, first degree murder is punishable by death or life imprisonment; robbery is punishable by up to 25 years; grand theft is 1-14 years. Idaho retained the death penalty and has carried out executions — Idaho uses lethal injection and has a functioning death row at the Idaho Maximum Security Institution (IMSI) in Kuna (Ada County).
Boise's rapid growth has strained Idaho's criminal justice system. Ada County's population growth (Boise, Meridian, Eagle, Kuna, Star) has increased crime in raw numbers even as the crime rate per capita remains lower than many major metros. The most significant criminal justice challenge in Idaho is the state's methamphetamine crisis — I-84 from Oregon through Boise to Utah is a meth distribution corridor, and Idaho has some of the highest meth manufacturing and trafficking rates relative to its population in the western United States. Boise's proximity to Oregon (where some drug possession was decriminalized by Measure 110 — later modified — and where marijuana is legal) creates cross-border drug issues. The Idaho Department of Correction (IDOC) oversees Idaho's prison system, with facilities including the IMSI, South Idaho Correctional Institution (Boise), and the Idaho Correctional Center (near Boise, previously operated by CCA/CoreCivic).
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