Last week I pointed out that Michael Moore, maker of the documentary "Sicko," portrayed the Cuban health-care system as though it were utopia -- until I hit him with some inconvenient facts. So he backed off and said, "Let's stick to Canada and Britain because I think these are legitimate arguments that are made against the film and against the so-called idea of socialized medicine. And I think you should challenge me on these things."

OK, here we go.

One basic problem with nationalized health care is that it makes medical services seem free. That pushes demand beyond supply. Governments deal with that by limiting what's available.

That's why the British National Health Service recently made the pathetic promise to reduce wait times for hospital care to four months.

The wait to see dentists is so long that some Brits pull their own teeth. Dental tools: pliers and vodka.

One hospital tried to save money by not changing bed sheets every day. British papers report that instead of washing them, nurses were encouraged to just turn them over.

Government rationing of health care in Canada is why when Karen Jepp was about to give birth to quadruplets last month, she was told that all the neonatal units she could go to in Canada were too crowded. She flew to Montana to have the babies.

"People line up for care; some of them die. That's what happens," Canadian doctor David Gratzer, author of The Cure, told "20/20". Gratzer thought the Canadian system was great until he started treating patients. "The more time I spent in the Canadian system, the more I came across people waiting. You want to see your neurologist because of your stress headache? No problem! You just have to wait six months. You want an MRI? No problem! Free as the air! You just gotta wait six months."

Michael Moore retorts that Canadians live longer than Americans.

But Canadians' longer lives are unrelated to heath care. Canadians are less likely to get into accidents or be murdered. Take those factors into account, not to mention obesity, and Americans live longer.

Most Canadians like their free health care, but Canadian doctors tell us the system is cracking. More than a million Canadians cannot find a regular family doctor. One town holds a lottery. Once a week the town clerk gets a box out of the closet. Everyone who wants to have a family doctor puts his or her name in it. The clerk pulls out one slip to determine the winner. Others in town have to wait.

It's driven some Canadians to private for-profit clinics. A new one opens somewhere in Canada almost every week. Although it's not clear that such private clinics are legal, one is run by the president of the Canadian Medical Association, Dr. Brian Day, because under government care, he says, "We found ourselves in a situation where we were seeing sick patients and weren't being allowed to treat them. That was something that we couldn't tolerate."

Canadians stuck on waiting lists often pay "medical travel agents" to get to America for treatment. Shirley Healey had a blocked artery that kept her from digesting food. So she hired a middleman to help her get to a hospital in Washington state.

"The doctor said that I would have only had a very few weeks to live," Healey said.

Yet the Canadian government calls her surgery "elective."

"The only thing elective about this surgery was I elected to live," she said.

Not all Canadian health care is long lines and lack of innovation. We found one place where providers offer easy access to cutting-edge life-saving technology, such as CT scans. And patients rarely wait.

But they have to bark or meow to get access to this technology. Vet clinics say they can get a dog or a cat in the next day. People have to wait a month.