Investigators examine knife that may have been planted at Peterson house
California investigators are conducting forensic tests on a knife they say was found at Laci Peterson's old house. A Modesto police spokesman says officials suspect the ten-inch knife was planted there just recently. A man who recently bought the home where Scott Peterson and his wife lived says there's a "red stain on the handle." Gerry Roberts says two of his friends found the knife in a cabinet near the swimming pool in the backyard. Investigators say the discovery came just days after a tabloid ran a story with rumors that the pregnant woman's throat had been cut. The police spokesman says investigators have found "no obvious signs of blood or tissue on the knife."