Penn DOT Forms

DL-21SC Self-Certification of Vehicle(s) Owned/Operated
http://www.dmv.state.pa.us/pdotforms/dl_forms/dl-21sc.pdf

DL-3805 Ignition Interlock Employment Exemption Affidavit
http://www.dmv.state.pa.us/pdotforms/dl_forms/dl-3805.pdf

DL-3731 Application for Ignition Interlock License/Return of Regular Drivers License
http://www.dmv.state.pa.us/pdotforms/dl_forms/dl-3731.pdf

All Penn DOT forms can be downloaded from this link.
http://www.dmv.state.pa.us/forms/index.shtml#licensing