If a driver holds a CDL and moves to another state:

If you are a new Pennsylvania resident and wish to obtain a CDL, you must surrender your out-of-state license. Pennsylvania law may prohibit issuing licenses to out-of-state addresses. If you surrender an out-of-state CDL, you must undergo a vision screening test. You must undergo additional testing if you want to be licensed to transport hazardous materials or operate a school bus.
DMV Writen Test