How do states use OBD II for emission inspections?

Many states connect a computer directly to a vehicle's OBD II system. The inspector can then read "faults." In some states, this type of inspection has replaced the tailpipe emission test.
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Function
Function overview
1 Warning light, braking by driver required
2 Controls in steering wheel
3 Radar sensor in front grille
Adaptive Cruise Control consists of:
• A cruise control system to maint ...
External sound sources
USB flash drive
To simplify the use of a USB flash drive, it is
advisable to only store music files on the drive.
It will take considerably longer for the system to index the files on the drive
...
Fast forward/reverse
Press and hold the buttons to fast
forward/reverse. This is done at one speed for audio files but several speeds can
be chosen for video files. Press the / buttons several times to increase the s ...
