Two Jennings County residents were arrested in connection with heroin sales in Seymour.
Two others traveling with the pair also were arrested on drug-related charges.
Police said James A. Jones, 30, and Linda Charles, 28, were traveling through Seymour midday Thursday when they were pulled over and arrested.
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Seymour Detective Brian Moore said the arrests of Jones and Charles stem from undercover drug buys that were made during an investigation of more than six months.
Jones faces two counts of dealing heroin, illegal possession of a syringe and maintaining a common nuisance. Charles faces two counts of dealing heroin and maintaining a common nuisance.
Police decided to arrest the pair after pulling over their Toyota 4Runner around 12:30 p.m. at Tipton Street and Stevens Way in Seymour, Moore said.
Two passengers in the vehicle, Edward J. Swindall, 41, and Nicole R. Spurlock, 21, both of North Vernon, also were arrested following a search of the vehicle and its occupants.
Swindall faces potential charges of visiting a common nuisance and possession of paraphernalia. Spurlock faces charges of possession of heroin and visiting a common nuisance.
Moore said police found drug paraphernalia, including a needle and a spoon, on Swindall, while Spurlock had a dose of powder-form heroin folded into notebook paper.
Moore said he believes the heroin was distributed out of Indianapolis into the local area.
All four were taken to the Jackson County Jail in Brownstown and were being held Friday without bond pending initial hearings.