The Federal Aviation Administration is investigating the use of a drone aircraft that was reported last weekend at the scene of a Hartford car crash. The use of drones for commercial purposes such as videography is prohibited by the FAA, and violators can be subject to penalties. The FAA said Friday that it became aware of the Feb. 1 incident on Thursday night and opened an investigation. WTIC-TV reported that Hartford police noted the appearance of a small unmanned aircraft in their report on the car wreck. The FAA is working to set up guidelines for commercial use of drones by the end of 2015.