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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Design Concept
The Volvo S40 is a tribute to Volvo's talented and multi-cultural design
teams in Gothenburg, Barcelona and California, who have captured the premium
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Storing a channel
A total of 20 satellite channels can be stored;
10 channels each for Sirius 1 and 2, see page 215 for detailed information on
storing
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stores ...
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