Serbian Prime Minister Aleksandar Vucic on Sunday passed a lie detector test that he took voluntarily over local tabloid allegations of involvement in a blackmailing affair. "The premier took upon his own initiative a lie detector test after Kurir published very serious charges that he had rejected," Interior Minister Nebojsa Stefanovic told a press conference. "The lie detector showed that he (Vucic) was telling the truth," the minister said, adding its results proved that Vucic never met with Kornic.