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Criminals often think they can outsmart everyone. "48 Hours" producers compiled a list of mistakes that prove otherwise.

The tire impressions. worried that she'd have to explain why the moving van was parked at her house for an extended period, she parked it at the supermarket and walked home with her dog. on sunday night, she returned to the supermarket, bought trash bags and muriatic acid and identified herself by using her discount card to save 34 cents. that night, she cleaned the truck, doused david's body with gasoline, set it on fire, then exchanged vehicles again and returned home. once in custody, tracey was found to have linear bruises on her thighs at exactly the height the hand truck would have hit h...

Was take a long, hard look at her. >> but donna was cooperating fully with the investigation and was an unlikely killer. she also had an alibi for thursday night and friday morning, the estimated time of death. >> as the investigation went along, it was clear that the evidence did not point in the direction of donna. >> david's second ex-wife also had an alibi for the time of david's murder, an alibi confirmed by numerous witnesses. next, investigators questioned david's current girlfriend, 32-year-old tracey frame. tracey said she last saw david on thursday, and she assumed he was headed to l...

When police interviewed david nixon's live-in girlfriend, tracey frame, she claimed david was headed to las vegas on the night he disappeared. tracey also revealed she didn't have an alibi for the night david was murdered. she said she was at home alone. >> we, as a family, didn't really know much of anything. he didn't bring her up. i never spoke to her on the phone. she was a mystery to all of us really. >> a background check revealed the two had an interesting past. the couple met at a lake party shortly after david's second wife left him. tracey was a successful accountant with no children...

>> it was discovered that he had some gambling debts and he had some troubles with the irs. >> tracey consented to a search of the house she shared with david. >> we searched the home with luminol. we did a search with cadaver dogs. >> they found no evidence of blood, and the cadaver dogs didn't find anything either. but investigators did find one possible clue. >> as they searched the house, they found electric blanket controls, but they didn't find an electric blanket, which was kind of odd, because they found david wrapped in an electric blanket. >> a day later, police found david's white l...