I'm not sure about officers doing that, but Texas emissions laws just got tougher this year. Now, the inspectors do stick the ODBII device onto the computer and check for codes (can't just remove that "Check Engine" bulb out of the indicator slot anymore).
The inspection stations require more sophisticated equipment to do the emissions checks, so I'm sure a lot of indies (possibly shady ones) just got obsoleted out of the business.
So far, all of my MB cars check out well above specs (whew)! VW is old enough to waive emissions (also good)!
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car