1.   Rather, the industry has turned to thousands of private-practice doctors, for whom testing drugs has become a sideline for making money.

2.   Testing has become possible only recently as a result of isolation of the cystic fibrosis gene.

3.   Testing has also become big business.

4.   Testing has become an end in itself.

5.   When the biology is sorted out over the next few years, testing may become routine.