A certificate of good conduct, like a certificate of relief from disabilities relieves a person of any disability, or bar to his employment, automatically imposed by law by reason of a conviction for a crime or offense. What is different from a certificate of relief from disabilities is that you are eligible for the Certificate of Good Conduct even if you have been convicted of more than one felony. However, to obtain a certificate of good conduct you must wait:
five years if the most serious felony on your criminal record is an A or B;
three years if the most serious felony on your criminal record is a C, D or E felony; or
one year if you only have misdemeanors on your criminal record.
The waiting period begins when you were last released from incarceration (prison or jail) or from the time of your last criminal conviction, whichever occurrence is last.