Batangas 2nd district Rep. Gerville “Jinky Bitrics” Luistro believes that the impeachment hearings against Vice President Sara Duterte must branch into a full-scale investigation into the alleged Michael Yang-Sammy Uy network that has been bared by former senator Antonio "Sonny" Trillanes IV.Luistro raised the call in her opening remarks during the House Committee on Justice hearing April 29, wherein she recalled the panel's examination of the V…