juvenile sealed records

[blodget]

WHen I was 17 I was arrested for burglary and attempted burglary and later convicted of a felony. I had my record sealed when I was 18 and have not had any legal trouble since. I am now 27 and wondering if I need to state that I have been arrested and convicted of a felony on Job applications and interviews? I have had background checks done and they came up clean. I am trying to become a Firefighter and heard they may possibly do polygraphs prior to hiring how do I handle that situation?