You need to discuss this matter with your attorney. In Pa, a felony drug conviction could result in the suspension of driver's license which would in turn have consequences against your CDL.
According to the federal CDL regulations, the only ways your CDL could be affected by a drug conviction would be if you were driving while impaired by the drugs, if you were transporting or possessing the drugs while "on duty", or if the felony somehow involved the use of a commercial vehicle.
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