Felons not having had their rights restored may not serve on juries. I have had felons report for jury duty and who failed to disclose a felony record. Fortunately we have discovered it before they served on a jury. If this is not discovered, a mistrial or retrial could be ordered as that juror is not qualified to serve.
http://www.wsmv.com/story/28895076/judge-declares-retrial-because-juror-was-convicted-felon