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Classifications printed so this section's negatives are not misread
The distinctions, with an Indiana instance of the nearest class: a series is separated murders by one offender across time with cooling-off; a spree is a compressed run without it — Christopher Peterson, the "Shotgun Killer" of the October–December 1990 northwest-Indiana spree, is the state's textbook instance and is classified a spree in the record, not a series; mass murder is one event; contract killing is a murder for hire inside someone else's crime. The county record's one major prosecution on this ground, Pleasureland, is none of these classes — a vice prosecution with no homicide. And the Crime leg's swept frame stands behind the whole article: not only no series, but no spree, mass, or contract case is seated in Osceola or Penn Township in the county record reached. The distinctions matter because aggregator lists blur them; this section does not.
Sources: Crime & Public Safety (banked frame and Pleasureland record); Peterson spree record (Lake/Porter County convictions) at press-and-court strength.