Sante-gakari indicates criminal trials in the Edo period for a samurai, his wife or his children with the family status that had omemie ([the privilege to have] an audience [with one's lord, a dignitary, etc].)
三手掛（さんてがかり）とは、江戸時代に行われた御目見以上の家格を持つ武士及びその妻子らに対する刑事裁判のこと。