Skins entering the city had been killed by a variety of chemical and biological weapons.

The tests were not conducted to study the effects of chemical and biological weapons on human health.

No one in the industry has worked on oil wells tainted by chemical or biological weapons.

Regular gear must now meet higher standards necessary to protect against chemical and biological weapons.

A main barrier to the use of chemical or biological weapons has been knowledge.

But there was no trace of chemical or biological weapons.

Iraq's presumed stocks of chemical and biological weapons are a wild card.

What, you may ask, is the key difference between chemical and biological weapons?

A palace is not required for the manufacture of chemical and biological weapons.

Iraq also would have to hand over all mobile production laboratories used for chemical and biological weapons.