Dried apples preserved with a cancer-causing chemical.

Frozen catfish laden with banned antibiotics.

Scallops and sardines coated with putrefying bacteria.

Mushrooms laced with illegal pesticides.

These were among the 107 food imports from China that the Food and Drug Administration detained at U.S. ports just last month, agency documents reveal, along with more than 1,000 shipments of tainted Chinese dietary supplements, toxic Chinese cosmetics and counterfeit Chinese medicines.

For years, U.S. inspection records show, China has flooded the United States with foods unfit for human consumption. And for years, FDA inspectors have simply returned to Chinese importers the small portion of those products they caught -- many of which turned up at U.S. borders again, making a second or third attempt at entry.

Now the confluence of two events -- the highly publicized contamination of U.S. chicken, pork and fish with tainted Chinese pet food ingredients and this week's resumption of high-level economic and trade talks with China -- has activists and members of Congress demanding that the United States tell China it is fed up.

Dead pets and melamine-tainted food notwithstanding, change will prove difficult, policy experts say, in large part because U.S. companies have become so dependent on the Chinese economy that tighter rules on imports stand to harm the U.S. economy, too.

"So many U.S. companies are directly or indirectly involved in China now, the commercial interest of the United States these days has become to allow imports to come in as quickly and smoothly as possible," said Robert B. Cassidy, a former assistant U.S. trade representative for China and now director of international trade and services for Kelley Drye Collier Shannon, a Washington law firm.

As a result, the United States finds itself "kowtowing to China," Cassidy said, even as that country keeps sending American consumers adulterated and mislabeled foods.

It's not just about cheap imports, added Carol Tucker Foreman, a former assistant secretary of agriculture now at the Consumer Federation of America.

"Our farmers and food processors have drooled for years to be able to sell their food to that massive market," Foreman said. "The Chinese counterfeit. They have a serious piracy problem. But we put up with it because we want to sell to them."