The defense produced more than 400 documents and presented 95 witnesses, including Hubert Webb himself and his father, along with other relatives and friends to support Webb’s alibi that he was in the United States from March 9, 1991, to October 26, 1992. On October 1, 1996, Judge Amelita Tolentino admitted only 10 of the 142 pieces of evidence the defense presented.
Among evidence that was not admitted by Judge Tolentino, was the note verbale from the United States Embassy claiming that Webb was in the United States at the time of the massacre. This coincided with his passport and Philippine Immigration records but were dismissed by Tolentino's court, due to belief that these documents can possibly be falsified. Tolentino stated that she would accept this evidence only if then Secretary of State Madeleine Albright would testify as to the veracity of the note verbale's contents. Moreover, Judge Tolentino also denied Webb's request to subject semen samples to DNA testing on the belief that the samples may no longer be intact. The accused alleged that by rejecting 132 of the 142 pieces of evidence, Tolentino had set the tone for their conviction. On July 24, 1997, the Supreme Court noted that Tolentino erred when she refused to admit the 132 pieces of evidence presented by the defense, although these were later admitted in court through an order issued by Tolentino.