Josh Duggar is in custody in Arkansas ... federal law enforcement sources tell TMZ.
The reality star was arrested Thursday by federal agents in Washington County, and he's being held in a detention center without bail.
We've obtained Duggar's mug shot, showing the former reality star posing with a bizarre smirk.
As we reported ... back in November 2019, Homeland Security agents were crawling around the car dealership where Duggar works in Arkansas, raiding his office in connection to a federal probe.
Josh's only current legal dispute, as far as we know, is a civil lawsuit filed against him for real estate fraud. It would appear his latest arrest is for something far more severe, though it's unclear exactly why he's been taken in.