He stood on the side of the road filming the officers, 
    who were back inside their car and looked like they were 
    about to leave. But they stopped and got out of the car.

    Video shows a masked federal officer running at Ben and
    slamming him to the ground. Three immigration officers 
    pinned him down and dragged him to their vehicle. 

    Ben says he was held in custody for about three hours.
    Before his release, officers photographed and fingerprinted him. 
    Then, before Ben realized fully what was happening, 
    an officer ran a swab, similar to a Q-tip, along the inside
    of his cheek.

The revenge options that ICE agents deployed against this witness are

    Physical assault
    Arrested and detained without need
    Involuntary collection of his DNA to chill 1A activities
    Involuntary collection of his DNA to empower future Gov revenge