1.   This second measure has the advantage of corresponding more closely to the theoretical risk of accident faced by any randomly chosen individual road user passing through the junction.

2.   Some experts, however, say widespread inoculations should take place only if the theoretical risk of a smallpox weapon becomes real.

3.   Some experts have raised the specter of a theoretical risk that such experiments might unleash another epidemic like AIDS, which many experts believe originated in primates in Africa.

4.   The prevailing opinion is that the potential benefit of alleviating the organ shortage, and the remote chance of finding a therapy for AIDS, outweigh the theoretical risks.

5.   The problem is that the vaccine itself is more dangerous than the theoretical risk of smallpox infection.

6.   But Health Department spokeswoman Diane Kirkpatrick said there is no comparison between vaccines that carry a slight theoretical risk and the Brazilian beef.

7.   Ottawa announced a ban on Brazilian beef last week, citing a theoretical risk of mad-cow contamination.

8.   Ottawa imposed a ban on Brazilian beef last week, citing a theoretical risk of mad-cow contamination from imported European stock.

9.   The advisers to the Food and Drug Administration expressed concern Wednesday about a theoretical risk that a similar human brain disease might be able to spread through blood.

10.   There is no evidence that the human variety can be spread through blood transfusions, but the FDA urged the restrictions on donors because of a theoretical risk.