The paperwork mess muddying home foreclosures erupted last month. But the legal strategy behind it traces to a lawyer's gambit in 2006 that has helped keep one couple in their home six years beyond their last mortgage payment.

Lillian and Robert Jackson stopped paying on their home in Jacksonville, Fla., in 2004 when business dropped off at their cleaning company. Eviction might have seemed inevitable when they faced a foreclosure hearing two years later.

But...