For a second time, it looks like the car thieves who jacked Charlie Sheen's ride may have gotten away with it because of problems with surveillance video.
Law enforcement tells us Charlie had a surveillance camera at his house, but the video only shows one person who appears to be "messing with the car." Problem is ... the video is "very shadowy" and it might be impossible to identify the thief.
As for surveillance video at the guard gate -- we're told it shows "nothing that was useful."
Rewind to 4 months ago, when car thieves hit Charlie for the first time. Again, cops struck out in the video department and the crime went unsolved.