DU has (probably unintentionally) highlighted how bad our immigration enforcement has been. Where else in the world could somebody receive a deportation order, and then just be left alone?

Yep, they admitted that actually deporting persons illegally present in the US has been low or no priority, and that the system can be and is gamed by illegals.
BTW, Part 1, the guy overstayed a student visa rather than entering illegally.
BTW, Part 2, Des Moines was the third school system in three states that failed to do a minimal background check.
BTW, Part 3, the guy was a registered voter in PA and voted by absentee ballot.
BTW, Part 4, one person responsible for his hiring was a mangler on HilLIARy's campaign staff.
This wasn't really, "He fooled us," but three school districts refusing to do minimal background check, probably (IMO) due to him being an immigrant and his skin color.