On the surface, Steve Barreras looked like another deadbeat dad. He'd been hauled into court and had his wages garnisheed. He and his new wife had lost their 2003 tax refund to pay child support. He had been peppered with threats and demands for money for a child he supposedly fathered five year ago. But this legal case had one big problem. Last week, a judge ruled the child does not exist— even though Barreras had already paid $20,000 in support. In what was apparently an elaborate ruse, the alleged mother orchestrated fake DNA evidence and forged a Social Security...