Basically, this means following the old canard - how often must it be disproved?

I thought this old canard had been put to bed.

We will not be turned aside by the old canards of reaction, racism and ruthlessness.

I recall that this old canard has been thoroughly debunked also.

The first recycles old canards; the second invents new ones.

So he resorts to the old canard that any criticism of a religion or group is racist.

She's also fed up with the old canard that she was responsible for the war.

And let's avoid the old canard, "Teaching morality is the parents' job."

"That's the old canard about how the players shouldn't care how the owners share their money," he said.