After weeks of hearing from forensic experts, jurors listen to Lana Clarkson's mother refute the defense's contention that her daughter committed suicide. After weeks of complex scientific testimony in which forensic experts held forth on the intricacies of the human anatomy, the aerodynamics of blood and the microscopic properties of fabric, the prosecution in Phil Spector's murder retrial rested its case Thursday with a lay witness and an appeal to common sense.