What is the test for substantial evidence in criminal cases?

permitted to substitute its finding of the ultimate fact for that reached by the constitutional as well as the statutory arbiter thereof. Circumstantial evidence may be as convincing in its force and as conclusive as the testimony of witnesses to an overt act.'" (People v. Stark (1936) 16 Cal.App.2d 467, 469.) "Circumstantial evidence may be sufficient to connect a defendant with the crime and to prove his guilt beyond a reasonable doubt." (People v. Pierce (1979) 24 Cal.3d 199, 210.)