nothing. this is what it leaves basically in concrete when an accelerant such as gasoline is poured on something. you know what i mean? >> jean also said she called the fire department from a phone in the house. investigators found the outside door was locked. if jean locked it on her way out, police saw this as evidence that she was in no hurry to save her husband. >> her husband is on fire, burning in this building. she runs outside, but she locks the door behind her. see, to me, that's very important. you think a jury's going to buy this? i can tell you right now they won't. >> major overbey asked jean to take a polygraph test, and she agreed. >> she was asked pointblank if she poured gasoline and set her