Here in Columbus they won't allow you to turn in anything off of the sealed system part of a hvac system, unless they have your certification on file. Some of them won't deal with the compressors anymore period, for fear of a 10,000 USD fine. The ones that do take them require the unit model# and pull date. They've thumbprinted me before, I don't know if that's still required or not, because I'm on file, it's always cash out the door.