COOPER COUNTY, Mo. — Four Kansas City-area residents are facing multiple felony drug charges after a traffic stop in Cooper County shortly after midnight Wednesday.

According to the Missouri State Highway Patrol, a trooper pulled over a vehicle driven  by Michael K. Eckstein, 36, of Kansas City, Kansas for alleged failure to display valid plates around 12:03 a.m. Wednesday.

The stop led to the seizure of drugs, according to a report from the Highway Patrol.

Eckstein and a passenger, William F. Schaal, 50, of Kansas City, Mo. both face felony allegations of possession of a controlled substance – amphetamines and a misdemeanor for unlawful use of drug paraphernalia.

The controlled substance and drug paraphernalia possession allegations were also leveled against Kristina N. Eckstein, 42, of Bonner Springs, Ks. as well as an allegation of possession of less than 10 grams of marijuana.

A fourth subject, Amy M. Stimac, 38, of Kansas City, Mo. faces preliminary charges of felony drug trafficking in the first degree, possession of less than 10 grams of marijuana and unlawful use of drug paraphernalia.

All four were transferred to the Cooper County Jail, where they were placed on investigative holds. Formal charges are currently pending.