A third Maui police officer charged with witness tampering remains employed by the Maui Police Department more than two years after the department suspected his involvement in the scheme and arrested him.

The case relates to a traffic stop in September 2015 in which one of the officers allegedly stole $1,800 from a motorist and then tried to cover it up.

Chase Keliipaakaua pleaded not guilty in U.S. District Court on Wednesday to charges that he conspired to commit witness tampering and destroyed evidence of his participation in the conspiracy. He remains free on $50,000 unsecured signature bond pending trial in January.

County officials say Keliipaakaua, 31, remains an employee but had his police powers taken away and has been assigned administrative duties. Fellow Maui police officers arrested him on a state witness tampering charge in October 2015 but released him pending investigation, which was later handed over to the FBI.

MPD fired two other police officers implicated in the scheme.

County officials say the department fired Walter “Kepa” Ahuna in July, two weeks after he pleaded guilty to conspiracy to commit witness tampering. Ahuna, 35, a former police sergeant, also agreed to cooperate with investigators in the prosecution of others. He faces a maximum 20-year prison term at sentencing in February.

The department fired Anthony “Ikaika” Maldonado last year. He too was arrested in October 2015, then released pending investigation. Maldonado was arrested on state charges of bribing a witness and hindering prosecution.

A federal grand jury indicted Maldonado, 28, his wife, Kelsey, and Keliipaakaua on Nov. 8. The indictment came one day after another defendant in the alleged scheme, Damien Kaina, pleaded guilty to conspiracy to commit witness tampering.

Maldonado pleaded not guilty last week to charges that he used his police powers to steal money from a motorist, lied about it and conspired to persuade the motorist to change his story. He is free on $50,000 unsecured signature bond.

Kelsey Maldonado pleaded not guilty to conspiracy Wednesday and is free on $25,000 unsecured signature bond.

Kaina was released without having to post bail or bond.

According to the indictment, Anthony Maldonado stole $1,800 from a motorist on Sept. 30, 2015, during a traffic stop. When he was arrested and questioned, Maldonado denied stealing the money and implicated another officer.

When he pleaded guilty in June, Ahuna said he, Maldonado and Kaina then discussed and carried out a scheme to bribe the motorist to withdraw the theft complaint with money Maldonado received from his wife.

The indictment says Keliipaakaua acted as lookout to assure that the motorist withdrew the theft complaint. When the motorist did not withdraw the complaint, Keliipaakaua called the motorist.

When the motorist still didn’t withdraw the complaint, Kaina and Maldonado also called the motorist. The indictment also says Keliipaakaua deleted text messages between him and Maldonado about the scheme.