 SALNs are often used by officials or political opponents to determine if government officials have "unexplained wealth", i.e.wealth that cannot be attributed to a salary, investment, gift, inheritance, or other legal sources and therefore are likely to have come from bribes, kickbacks, grease money or other forms of corruption.During the trial of Joseph Estrada, the 13th President of the Philippines, for plunder, his SALN played a key role.