1.   The men breathe air that is filtered to remove any radioactive dust, nerve gases or biological toxins.

2.   A senior Pentagon official said the al-Qaida forces likely have at least basic chemical weapons, such as chlorine and phosgene poisons and some biological toxins.

3.   Every shipment is also subjected to testing by an outside laboratory for such contaminants as insects, lead, cadmium and biological toxins.

4.   FBI agents acknowledge they never found a weapon or any biological toxins during their raid.

5.   It would take tons of chemicals to cause the loss of life that a mere kilogram of biological toxins could inflict.

6.   Moreover, governments have yet to consider seriously the threat of chemical weapons and biological toxins.

7.   Other die-offs, also suspected to have been caused by biological toxins, have hit penguins elsewhere.

8.   Pearson wrote that biological toxins can do the same damage as chemical toxins like nerve gas, with only one-tenth of the material needed for chemical warfare.

9.   The House passed several noncontroversial bills, including one to issue a new class of war bonds and another to make it a crime to handle biological toxins carelessly.

10.   Other officials have said al-Qaida could probably deploy chlorine, phosgene and some biological toxins as weapons.