*Must be grandfathered in, having been continuous operation since December 31, 1999<ref name="gpo.gov">https://www.gpo.gov/fdsys/pkg/PLAW-111publ148/html/PLAW-111publ148.htm</ref> | *Must be grandfathered in, having been continuous operation since December 31, 1999<ref name="gpo.gov">https://www.gpo.gov/fdsys/pkg/PLAW-111publ148/html/PLAW-111publ148.htm</ref> |