<prompt> Translate the following text to EnglishUshahidi huo unaweza kujumuisha mashahidi wa kuthibitisha - na hata mtu wa kawaida anayejiwakilisha mwenyewe ana nguvu ya subpoena kudai ushuhuda.  <response>: That evidence can include corroborative witnesses -- and even a layperson representing himself has the power of subpoena to require testimony. 