Firms not covered by the Federal regulation could ignore the voluntary ban and continue to make contributions.

A voluntary ban was imposed by the London trade in order to give stocks breathing and breeding space.

The municipal industry has already put into effect a voluntary ban on such contributions.

In reality, the "voluntary ban" was nothing but a news release.

As an effective policy measure, the voluntary ban was a joke, a scam, a nothing.

A voluntary ban already exists on advertising near schools but ministers want firms to go further.

The voluntary ban on late-night flights, they say, is not working.

The voluntary ban on some computer-based trading remains in effect.

The voluntary ban will effectively become mandatory when the agency's rule goes into effect.

In some other countries, such as my own, there is a voluntary ban.