produce allegations. These interviews were instrumental in the jury members failing to produce a guilty verdict against Buckey, and several similar trials with similar interviewing techniques produced similar not guilty verdicts when juries were allowed to view the recordings. In response, prosecutors and investigators began "abandoning their tape recorders and notepads" and a manual was produced for investigating child abuse cases that urged prosecutors and investigators not to record their interviews. Continued allegations of secret tunnels In 1990, parents who believed their children had been abused at the preschool hired archaeologist E. Gary Stickel to investigate the site. In May 1990, Stickel claimed he found evidence of tunnels, consistent with the children's accounts, under the McMartin Preschool using ground-penetrating radar. Others have disagreed with Stickel's conclusions. John Earl wrote in 1995 that the concrete slab floor was undisturbed except for a small patch where the sewer line was tapped into. Once the slab was removed, there was no sign of any materials to line or hold up any tunnels, and the concrete floor would have made it impossible for the defendants to fill in any tunnels once the abuse investigation began. The article concluded that disturbed soil under the slab was from the sewer line and construction fill buried under the slab before it was poured. Further, Earl noted that some fill from beneath the concrete slab was dated to the year 1940. W. Joseph Wyatt's 2002 report concluded that the so-called tunnels under the preschool were more plausibly explained as a series of adjacent rubbish pits used by the owners of the site before the preschool's construction in 1966. Materials found during the excavation included bottles predominantly dated to the 1930s and '40s, as well as tin-can fragments, plywood, inner tubes, professionally-butchered livestock bones, four small containers of trash, and a former owner's old mail box. Only three small items found near the edge of the concrete slab were dated after 1966. Wyatt suggested one of these – a fragment of a plastic snack bag – was most likely dragged into the pit by rats or other scavengers, just as Stickel himself had suggested likely happened for other debris that didn't fit his tunnel theory. The remaining items, per Wyatt, had likely been left by a plumber digging from adjacent to the building to avoid damaging the concrete pad. Moreover, Wyatt speculated that Stickel's conclusions were colored by his