How do I get a arrest record expunged? I love in Illinois.?

I was arrested for something about 7 yrs ago and when I went to trial the case was thrown out of court. Ever since then, when I have applied for a job this arrest still pops up and causes trouble even though the case itself was thrown out of court and I was not guilty of any crime. I had a FOID card violation, not... show more I was arrested for something about 7 yrs ago and when I went to trial the case was thrown out of court. Ever since then, when I have applied for a job this arrest still pops up and causes trouble even though the case itself was thrown out of court and I was not guilty of any crime. I had a FOID card violation, not a murder charge. How do I make this arrest go away or expunged?
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