HOUSTON (AP) — The amount of explosive gas tainting a North Texas neighborhood's water supply has increased in recent years, but the state's oil and gas regulator says it can't link the methane to drilling activity nearby, according to a report it released Wednesday. [...] Peter Pope, the agency geologist who signed off on the report, wrote that staff "has determined that the evidence is insufficient to conclude that Barnett Shale production activities have caused or contributed to methane contamination beneath the neighborhood." The agency's report contradicts findings by independent scientists who have done fingerprint-like analysis of the methane in the water wells and compared it to those being produced by a gas driller. The U.S.