I hate to say this, but I am constantly taking pictures of bad installations that are owned by my employer. As such I don't get yelled at... well... some exceptions, such as taking pictures of installations done ay others who are permitted to use the facilities, and then only after the report telling them to clean things up. I was asked one time at the orange store to ask before I took pictures, but they were OK with it (I was working on some training for maintanence personnel and was just taking pictures of uninstalled devices).