In 2003, he wrote against General Efraín Ríos Montt's bid to return as President of Guatemala (Toronto Star, 9 November 2003).
In 2013 Dr. Ball provided expert testimony in Guatemala's Supreme Court in the trial of General José Efraín Ríos Montt, the de-facto president of Guatemala in 1982-1983.
Entre Ríos Province | Entre Ríos | Efraín Huerta | Los Ríos Province | Osvaldo Ríos | Ocho Rios | Los Ríos | Gabriel Rios | Francisco Giner de los Ríos | Puerto Montt | Marcelo Ríos | Gualeguaychú, Entre Ríos | Efraín Ríos Montt | Roberto Ríos | Paraná, Entre Ríos | Los Rios | Gregorio Hernandez Rios 'El Goyo' | Efrain Escudero | Zury Ríos Montt | Villa Elisa, Entre Ríos | Montt Mardié | Miguel Ríos | Marcelo Rios | Manuel Montt | Los Rios District | Julián Ríos | Josef de Mendoza y Ríos | José Amador de los Ríos | Jorge Montt | Gabriel Ríos |
Between 1980 and 1983, through the presidencies of Romeo Lucas Garcia and Efrain Rios Montt, the PMA played a key role in the counterinsurgency operations in the predominantly indigenous Altiplano, where the EGP maintained its strongholds.