A woman's sex claims against the leader of a Polish coalition party and one of his colleagues appear to have been partially disproved by a DNA test.
Both Self-Defence politicians deny having sex with Ms Krawczyk
The woman, Aneta Krawczyk, alleges she had to sleep with both Self Defence leader Andrzej Lepper and deputy Stanislaw Lyzwinski to get employment.
But her claim to have a child fathered by Mr Lyzwinski has been all but ruled out by the test ordered by prosecutors.
Mr Lepper denies having sex with the woman and says her claim is "insane".
Prosecutors have been investigating the claims against Mr Lepper, who is deputy prime minister in the coalition, since they were made in a newspaper.
Sexual abuse offences of this kind carry a maximum prison term of eight years, prosecutors say.
The scandal has threatened to break up the coalition and spark early elections.
'Almost 100% certainty'
Ms Krawczyk alleged last week that she had slept with Mr Lepper in 2001 to obtain a political job.
She said that in order to keep her job she had also been required to have sex with Mr Lyzwinski, and she said other female employees also faced harassment.
"The [DNA test] results exclude the possibility of Stanislaw Lyzwinski being the father of the youngest child [of Ms Krawczyk]," said Krzysztof Kopania, spokesman for prosecutors in the central city of Lodz, where the test was carried out.
"This kind of test gives almost 100% certainty so I don't think there's any reason to question the results."
Mr Lyzwinski has denied having sex with the woman and Mr Lepper has said he is the victim of a campaign to discredit him and the governing coalition.
Marek Migalski, a sociologist at the University of Silesia, told Polish TV channel TVN 24 that the DNA test result was "good news for Self-Defence and for the... coalition because it undermines at least to some extent" the case against them.