Legal Question in Consumer Law in Pennsylvania

Yes. Here's an excerpt from a PA DMV Fact Sheet:

INSPECTION

In order to maintain safe highways, the once-a-year safety inspection system requires that all used vehicles are inspected within 10 days of sale unless a valid inspection sticker is displayed on the vehicle. The buyer is responsible to have the car inspected, which can be done at any Pennsylvania certified inspection station. If the vehicle is registered in an area of the commonwealth participating in the Emissions Inspection Program, the vehicle will also be required to have an emissions inspection.