[Poohbah]

The conducted a citizens arrest upon witnessing a felony crime.

Actually, they didn't witness it, and it wasn't a felony.

In Arizona, you may execute a citizen's arrest on either:

1. REASONABLE BELIEF that a specific felony was committed by the arrestee; or

2. ACTUALLY SEEING the commission of a misdemeanor.

Illegally crossing the border is not a felony in and of itself--it is a misdemeanor.

These guys didn't see these two cross the border.

Bottom line: if you intend to arrest, you need to know what you're doing.

[Regulator]

Illegally crossing the border is not a felony in and of itself--it is a misdemeanor.

Only the first time and you know it. Second time - and all further entries that someone is arrested and convicted for - are felonies.