Not sure about Maine, but when I lived in Virginia, they had YOU turn on the signals, sound the horn, show that the brakes worked, ect...they wouldn't sit on your bike, even at a bike shop that did inspections.
Depending on the shop they may have you show them. But I've never had a ship take my bike out for a spin during an inspection. No reason. They can feel the brakes and see the lights as it sits with the stand down.