OSAKA -- The Osaka High Court acquitted an ex-nursery school teacher of perjury Friday in the trial concerning the alibi of former colleague Etsuko Yamada, 48, who had been charged with killing a 12-year-old boy in 1974 but was cleared three times.

Iuko Tada, 55, was also acquitted for the third time, following the third acquittal of Kabutoyama Gakuen's former principal, Kiyoshi Araki, also charged with perjury.

Tada had been charged with falsely testifying that she was with Yamada at the time police alleged Yamada killed one of two children found dead in a septic tank on the grounds of the now-defunct school for the mentally disabled.