Plsi would like to know if am eligible for Sia badge I'm 43years old and I have a criminal record which is imp?

plsi would like to know if am eligible for Sia badge I'm 43years old and I have a criminal record which is importation of class A drug 22/04/04 I served two and half years in prison punishment on finished my sentenced on 22/11/2006. But am worried, will this still be count against me not to do security job ?