In last night's Oriole game, one of the opposing players hit what appeared to be a bases loaded double down the right field line. It was initially called "fair" by the closest umpire. The Orioles challenged the call because it landed in foul territory, based on the clear divot in the dirt on the foul side of the line.
However, the call was upheld on the grounds that the camera wasn't close enough to see if any chalk was kicked up. They don't have cameras for down the line calls.
Technology is really good, but only if it is used properly.
The Orioles came back to win anyway.