But he has also asked Tommy G. Thompson, the secretary of health and human services, if he is going to ban such substances.

Environmentalists say that without laws requiring companies to use recycled goods and laws banning substances like Styrofoam, the program will be limited.

It could not be immediately determined which athletes were accused of taking which banned substances.

We passed a Waste Law back in 1990 and an ordinance banning halogenated substances in 1993.

We agree that a mechanism to ban new substances should be set up.

This can then mean banning substances and phasing them out or permitting their continued use, subject to certain conditions.

The system currently in force only bans dangerous substances and preparations, which is clearly inadequate.

It leads us to ban active substances which do not pose any problem at all in practice.

Consequently, I totally agree with additional measures being taken to limit or even ban ozone-depleting substances.

One of our starting points was that it takes too long today to ban new substances that keep appearing.