It was February 22, and Lawrence Riesz finally had an idea about how to diagnose all the mysterious problems in his home. Since he and his wife bought the place in Parkland two years ago, the refrigerator had quit inexplicably. Then the dryer. Then the intercom. And three TVs had failed. He thought it might be electrical, but experts he brought in offered no explanation. Then there were the health issues. Riesz and his wife, Jennifer Schnee, an ob-gyn, and their two children had all suffered from sinus infections. Two of their three children — a 2-year-old and 4-year-old — had developed asthma. He knew it could all be normal colds, and asthma runs in the family, but he couldn't help thinking that what was corroding his appliances could be doing the same to his family.

It was late, perhaps midnight, when Riesz, who wears his salt-and-pepper hair at shoulder length, came up with his idea. Riesz is an emergency-room doctor at Broward General, so he used the same logic he applies to his patients. He needed to get inside his walls to figure out what was wrong.

He removed his air conditioning vents hoping he could peek inside, but none gave him access inside the walls. Then he remembered the broken intercom. He removed the four screws holding the TV-tray-sized intercom to the wall and let it hang from its corroded wiring. The space was too small to peek in, so Riesz grabbed his web cam. Slowly, he lowered the video camera by using the cord that connects it to his laptop. About a foot down, behind a tangle of blue speaker wires, he saw words come into focus:

"Tianjin, China."

He ran upstairs to tell his wife. "Holy crap, I just saw it! We have Chinese drywall!"

Back then, homeowners were just figuring out that Chinese drywall installed in as many as 100,000 houses nationwide produces high levels of sulfur and, some believe, releases toxic chemicals into the air. The gases corrode wiring and pipes and, more important, could cause home­owners long-term health problems.

The fact that China was the source of the defective drywall wasn't surprising, considering the country's history of exporting toys containing lead paint. But what makes the drywall worse is that there's no recall that will fix it short of tearing homes down to the studs to remove the potentially hazardous walls.

Riesz and Schnee filed this lawsuit March 10 against builder WCI and the company that supplied the contractor with the drywall from China. But like many whose homes have Chinese drywall — and there are an estimated 35,000 in Florida — the couple may never get anyone to repair the home. Most companies responsible have refused to acknowledge the problems, while others, like WCI, have filed for bankruptcy.

And we may never know who's responsible. Legal technicalities make it almost impossible for homeowners to figure out if suppliers sold the Chinese drywall and builders installed it knowing that the stuff was potentially harmful.

"Little by little, people are getting little bits of information about how bad this stuff might be," says Allison Grant, the Boca Raton lawyer who helped uncover the problem with her website chinesedrywall.com. "But the truth is, we may never find out who knew in advance of all of this."

The drywall from China first showed up during the height of the building boom in 2005 or earlier, when suppliers ran out of U.S.-made building supplies. Home­owners first began learning that the Chinese drywall is defective this past November, when websites like the one Grant started popped up. Some have speculated that an ingredient in the gypsum used to manufacture drywall could produce toxic chemicals when exposed to humidity.

Homeowners have begun blaming the Chinese drywall for a growing list of health problems. Mary Ann Schultheis, for instance, says she suffers from sinus headaches, blurred vision, and now bronchitis. She worries that it's because of the Chinese drywall in her home in Banyan Isles. Schultheis, 59, and husband Gary used their retirement savings to buy the house and now have no money to move. "I'm going to lose everything on this place," Schultheis said. "All my life savings, every penny we had, is in this house. We're just going to walk away?"

No studies have been completed to determine if Chinese drywall is at fault. But Patricia Williams, a toxicologist and associate professor at the University of New Orleans, is studying about 50 people living in homes with Chinese drywall. Her findings won't be available until June, but she tells New Times that homeowners have reported suffering from runny eyes, bloody noses, sinus problems, and, most troubling, "acne-like rashes" that could be signs that dangerous compounds are in the air.

"You're reading everywhere about sulfur, but there are many other things I'm studying in the drywall that are very toxic," Williams says. She'll present findings at a conference June 4 and 5 in Orlando for lawyers involved in Chinese litigation cases.

Builders are among those calling for independent testing. But even before those results are known, some contractors, including giant homebuilder Lennar Corp. of Miami, have offered to move homeowners into temporary housing and replace the Chinese drywall.

Lennar also filed this lawsuit in January against 25 companies accused of making, importing, and distributing Chinese drywall (click here to read a statement Lennar released after filing the suit). Among them is Miami-based Banner Supply Co., which is accused of distributing a majority of the Chinese drywall in South Florida. Banner Supply owner Jack Landers declined to comment. "We're still in litigation and still investigating the matter," Landers said from his home in Fort Lauderdale.