Those 30 years were not without hardships or serious tests of will.

"You're not going to end drug abuse without random tests," he said.

With or without such tests, the five-year survival rate for people found to have lung cancer is only 15 percent.

Thanks to that, the car can be registered in each European member state without additional national tests or approval.

Without further tests, the accuracy of these calculations is uncertain.

How am I supposed to figure this out without tests?

Such a test would make it possible to screen for cancer without elaborate tests.

Without tests, proponents say, the country won't be able to assess whether it is moving toward the goals.

And for those patients experiencing symptoms, he said, the evidence is usually clear enough without other tests.

And without tests, no nation seeking to develop nuclear arms could know for sure whether its weapons worked.