This report compares arrestees in three categories of probation history – never served probation (or not in the past 12 months), served probation in a county other than Maricopa, and served probation in Maricopa County, each defined for either lifetime or the past 12 months, ultimately yielding six analysis categories. Each of the three probation categories are mutually exclusive within a given time period (i.e. lifetime and past 12 months).