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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Starting and stopping the engine
See page 114 for information on starting the engine and switching it off. ...
2005 Volvo XC90 Review
Volvo's best-selling vehicle, the XC90, which arguably is the best crossover
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Rearview mirror
To reduce glare from the headlights of following
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