Justice Hillary Chemitei dismissed an application by the National Assembly Deputy Minority Leader challenging a bid by the Director of Public Prosecutions (DPP) to arrest him over the claims.
Midiwo made the assassination claims at a funeral in Bondo on April 7, 2012.
In his case, Midiwo had asked Justice Chemitei to quash the arrest warrant by the DPP, saying he should not be arrested but congratulated for blowing the whistle on the plot.
But the DPP, through State Counsel James Warui told the court that Midiwo had failed to substantiate his allegations and made the assassination claim to gain political mileage.
In his ruling Monday, Justice Chemitei said the CORD lawmaker had not proved his case.
“It is my finding that the petitioner has failed to demonstrate that the intended prosecution was driven by another purpose other than justice and enforcement of the law. The same is hereby dismissed with costs to the respondents,” ruled Justice Chemitei.