51.   But it says that in practice, companies use tests that include making sure that a prototype of a device accurately measures blood pressure in repeated laboratory tests.

52.   But some experts doubt the tests will be used that often.

53.   But the House version would allow states to use different tests from district to district, making it impossible to determine whether any such gaps were being closed.

54.   But the test cannot be used on blood samples.

55.   But the transit agency said it did not agree that the wrong test had been used.

56.   But the commissioner seemed to back away from his plan to use the test to help determine which schools were failing.

57.   But the judge said the department did not have the authority to use such tests, which had been implemented nationwide, and ordered that the plant remain open.

58.   But those tests are used only for statistical analyses, and the results are not disclosed to mothers.

59.   But this was the first evidence that those who use the test can avoid colon cancer in the first place.

60.   But Triche says he expects it will not be long before doctors begin using the tests routinely.