This policy prevented captains from stating prices that were too low.

Rebecca Edwards, a graduate student in history, said the policy would prevent more than one type of abuse.

Since 1979, the policy has prevented 400 million births from occurring.

In a prepared statement, Campbell said only that corporate policy prevented any discussion of the matter.

Critics say the new policy will prevent thousands of students from entering college.

She also said the policy would prevent an expansion of the program to reach the millions more who need assistance.

No policy or T-shirt, however, can prevent the most determined from acting badly.

But even this policy doesn't prevent the occasional quasi-armed conflict.

She said that new policies would prevent it from happening again.