In most cases, the applicant will be asked to perform a relatively simple preliminary test of the claim, which if successful, will be followed by the formal test. (religion.blogs.cnn.com)
Three other cases have tested positive in preliminary tests on their urine samples and are due further checks. (fortune.com)
Engineers have already run the plant at capacity for as much as 12 hours at a time, and preliminary tests show the equipment works efficiently. (discovermagazine.com)