base interrogation points = 20 + 3 * level + 0.5 * leadership;

threatenvalue = soldiers threatening effectiveness * usApproachFactorThreaten * (100 + background threaten effectiveness modifier) / 100

interrogation points = (base interrogation points * threatenvalue  * (100 + background interrogation effectiveness modifier)) / 100;

final interrogation points = (interrogation points * prison interrogation performance modifier) / (700000);

final interrogation points can then still be lowered by fatigue