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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Cleaning the BLIS camera lenses
In order to function optimally, the BLIS camera
lenses must be kept clean. They can be wiped
clean with a soft cloth or wet sponge.
CAUTION
• Clean the lenses carefully to avoid
scratching.
...
Introduction
City Safety™1 is a support system designed to
help the driver avoid low speed collisions when
driving in slow-moving, stop-and-go traffic.
City Safety™ is not active if your vehicle’s
speed is ...
External audio source volume
If an external devices such as an MP3 player or an iPod is connected to the AUX
socket, the device's volume may be different from the volume of the internal sound
sources such as the disc play ...
