been expelled from Laci's decaying body, though when cross-examined in court the following year, he conceded that he could not determine whether he had been born alive when this occurred. Dr. Peterson also found meconium in the fetus's bowels, which is the first stool passed after birth. The discovery of the bodies created a greater sense of urgency for Brocchini and Buehler, who had put a tracker on Peterson's car. Knowing that he was in San Diego at the time, they feared he would escape across the border to Mexico. Brocchini commented in 2017, "I just thought, 'We've got to find Scott right now. He told me he was there and that's where the bodies come up? I mean, I believe it was premeditated, he planned it ... San Diego was pretty darn close to the Mexican border. Scott knew the area pretty well. That's where his parents lived. That's where he lived. So it wasn't like he was going to have to get on MapQuest to try and figure out a way to get to Tijuana." The FBI and Modesto Police Department performed forensic searches of Peterson's home. The FBI also conducted mitochondrial DNA testing on a hair from pliers found in Peterson's fishing boat that linked them with hairs recovered from Laci's hairbrush. The authorities also searched Peterson's pickup truck, toolbox, warehouse, and boat. They found a homemade anchor in the boat Peterson purchased two weeks earlier. Peterson told a detective that he made the anchor in his boat, using a 90-pound bag of concrete, and used the rest to repair his driveway. However, petrographer Robert O’Neill said that microscopic analysis of solid fragments and powder found in Peterson's warehouse, pickup bed, boat, boat cover, and a plastic pitcher matched the material in the single anchor, as well as a pea-sized pebble police found in his living room, but none matched a sample from the driveway. Detective Henry Dodge Hendee testified that he found a cement-like substance on the wooden bed of a boat trailer when he searched Peterson's warehouse on December 27. Hendee pointed to what he said were five circular areas on the trailer that had less powder than other areas on the trailer. He also found a dustpan surrounded by the white powder and a sledgehammer. Prosecutors believed that Peterson made five anchors, and used four of them to sink Laci's body in San Francisco