Lift Laws | Suspension Lift Laws By State
For Canada, your provincial highway traffic act has all the details.
IBC has its own special place in hell from the rumors i've heard.
I checked PA in the liftlaws link... no mention of wheel spacers/adapters.
I checked my own province's Act(Motor Vehicle Act Regulations)
There's a tire/wheel section, but no spacer/adapter info.
Inspection guidelines aren't the easiest to find....