Ask your son since when does the BP enforce civil law?
It’s CUSTOMS and Border Patrol now slick.
The CUSTOMS part gives them a lot of authority in civil law when it comes to federal facilities and property.
When they are deputized either as a Deputy Marshall or local Sheriff Deputy.
The rioters in DC is a case where they were deputized as deputy US Marshalls, and way out in the boonies, deputized by local sheriffs office to provide back up to local PDs.
What we see today in the riots are BP guys arresting thugs that are attacking federal property, so even when they are deputized, they didnt need it because they were stopping thugs from destroying federal property.