Supporting Documentation For each download, reference the criteria list in the right-hand column for description detail. Supporting document samplesCriteria Sample Employment Verification LettersAdvanced Cardiac Sonographer (ACS)Certified Cardiographic Technician (CCT)Certified Rhythm Analysis Technician (CRAT) Registered Congenital Cardiac Sonographer (RCCS)Registered Cardiac Electrophysiology Specialist (RCES)Registered Cardiovascular Invasive Specialist (RCIS)Registered Cardiac Sonographer (RCS)Registered Phlebology Sonographer (RPhS)-Non-Physician CandidateRegistered Vascular Specialist (RVS)Make sure that your submitted letter(s) contains informationin sample.Sample Student Verification LettersAdvanced Cardiac Sonographer (ACS)Certified Cardiographic Technician (CCT)Certified Rhythm Analysis Technician (CRAT) Registered Congenital Cardiac Sonographer (RCCS)Registered Cardiac Electrophysiology Specialist (RCES)Registered Cardiovascular Invasive Specialist (RCIS)Registered Cardiac Sonographer (RCS)Registered Phlebology Sonographer (RPhS)-Resident FellowRegistered Vascular Specialist (RVS)Make sure that your submitted letter(s) contains informationin sample.Sample Clinical Verification LettersRegistered Congenital Cardiac Sonographer (RCCS)Registered Cardiac Electrophysiology Specialist (RCES)Registered Cardiovascular Invasive Specialist (RCIS)Registered Cardiac Sonographer (RCS)Registered Phlebology Sonographer (RPhS)-Physician CandidateRegistered Vascular Specialist (RVS)Make sure that your submitted letter(s) contains informationin sample.