Federal law enforcement arrested retired Guam police officer and former FBI task force member John Topasna Mantanona, aka “Boom”, in Inarajan today following an indictment handed down by a federal grand jury on June 19.
Mantanona was arrested and charged with obstructing justice by endeavoring to influence a juror and conspiracy to distribute methamphetamine hydrochloride.
According to the indictment, Mantanona “knowingly and corruptly endeavored to influence, intimidate and impede” a juror, in the discharge of his duty in a federal criminal trial and “corruptly influencing” to vote not guilty and influencing the juror to persuade other jurors to vote not guilty.
Court documents allege the obstruction occurred between Oct. 11, 2018 and Dec. 27, 2018.
Mantanona was charged with a second count of obstructing justice by endeavoring to influence a juror by “corruptly positioning individuals within the courtroom” in order to influence and intimidate a juror to vote not guilty.
A third charge of obstructing justice by endeavoring to influence a juror alleges Mantanona influenced and intimidated a juror to sign a false and fraudulent affidavit.
Mantanona is also accused of “knowingly and intentionally conspiring” to distribute 50 grams or more of methamphetamine hydrochloride between Jan. 1, 2016 until about Jan. 15, 2019.
Mantanona’s brother, William Topasna Mantanona, was also arrested today in Chalan Pago charged with obstructing justice by endeavoring to influence a juror and making a false statement to a federal agent.
William Topasna Mantanona allegedly influenced a juror, Gregorio Concepcion Tyquiengco, to vote not guilty and influenced the juror to persuade other jurors to vote not guilty in the criminal trial of Raymond John Martinez and Juanita Moser.
On Dec. 21, 2018, William Mantanona also allegedly made a false statement and representation to the Department of Homeland Security concerning an investigation by the DHS of juror interference in the trial.
Tyquiengco was arrested in Merizo and charged with contempt of court as a misdemeanor.
According to the indictment, Tyquiengco violated the District Court’s order by discussing the case during the trial with an individual outside of the jury and federal court system, namely William Topasna, and “agreed with W.M. to issue a verdict of not guilty at the conclusion of the trial,” court documents state.
Martinez and Moser's case was moved to California after jurors on Guam twice failed to reach a verdict in their drug case trial.
Plea agreements have been filed in the U.S. District Court for the Central District of California for the couple who were charged with attempting to smuggle 8 pounds of methamphetamine, or "ice," from California to Guam in 2015.
Court documents previously filed in the Guam case against Martinez and Moser state John Mantanona worked as an investigator for Martinez and Moser's defense.
In one recording between Moser and John Mantanona, taken about two weeks before the second mistrial on Nov. 13, 2018, the two are heard talking about how John Mantanona wanted to get people to show up in force to support defendants in front of the jury.
John Mantanona also stated that one of the jurors is his uncle.
In a second recording, between Martinez and John Mantanona, the two appear to talk about payment to former police officer in the amount of "13," which federal prosecutor Fred Black previously said he assumed to mean $13,000.