Witnesses called Tuesday during O.J. Simpson's murder trial:

ANDREA MAZZOLA: LAPD criminalist; changed her testimony, saying she collected three blood stains at Simpson's estate that she earlier said were collected by her supervisor, Dennis Fung; first said mistakes aren't made on how to pick up evidence, but acknowledged mistakes can happen; testified she used, at Fung's direction, one cotton swab to test for blood in three places in Simpson's Bronco, the accelerator, the brake pad and the emergency brake; said she didn't question Fung's orders, although she had been trained to do things differently.