11.   Because testing is also expensive, it can divert money that could otherwise be used for drug treatment and other social services, Ms. Rubinstein said.

12.   Bayer acknowledged that there was a price to pay if testing was voluntary.

13.   Bowers maintained, though, that testing is only one way of curtailing the use of banned substances.

14.   A Democratic staffer, however, said she thought testing was unnecessary.

15.   Also, testing for steroids is not as easy as testing for cocaine or marijuana.

16.   But days later, a senior scientific advisory group to the Energy Department concluded that low-yield testing was unnecessary.

17.   But critics say safety testing has not been adequate so such foods should be labeled to give consumers the choice of avoiding them.

18.   But his testing was not complete enough to rule out other thallium compounds that would not have matched the thallium nitrate found in the garage.

19.   But many education advocacy groups, while encouraged that the Bush administration is talking about the gap, warn that testing is not enough.

20.   But Nakhleh, who is one of the young scientists working full time in the program, says testing is simply a more scientific approach.