State officials say they randomly tested older-model cars on the roads.
Nearly one-third flunked smog tests -- even though they had recently passed the test at certified smog stations.
The state has yanked licenses of 22 smog stations since June.
Now, a bill in Sacramento aims to reduce fraud by changing the tests, at least for newer cars.
No more putting a sensor in the tailpipe.
Instead, scanners would read performance data from computers that are onboard cars made after 1996. The data would go directly to the state.