A bill, promoted by San Diego’s California Innocence Project and now approved by the state senate, would make testimony based on disputed CSI techniques inadmissible in court. Plus, both of the journalists killed in Tijuana this month had sought help from a Baja California program aimed at protecting those who report the news — that help never came. On a lighter note, this weekend in the arts, features a lot of piano music, the intersection of poetry and art and Pulitzer-prize winning photojournalism.