Social Workers Arrive at Jackson House

Social workers from the L.A. County Department of Children and Family Services have just returned to the Jackson family compound in Encino, CA to finish investigating the stun gun incident ... sources tell TMZ.

As we previously reported, the DCFS is going back to the house to interview a Jackson employee who hasn't been around the last couple of days.

We're told the DCFS has not decided if they will take any additional action against the Jacksons.