Final answer:
Proficiency test samples are not tested multiple times to ensure accurate results.
Step-by-step explanation:
The statement is false. Proficiency test samples are not tested multiple times to ensure accurate results. A proficiency test is designed to measure a person's knowledge or skills in a particular subject. It is typically administered once, and the results are evaluated based on a predetermined set of criteria. There is no need to test the same sample multiple times, as the purpose of the test is to assess an individual's proficiency at a given moment.