I understand about the whole 2 different locations, diff set of clothes, ect. Sure, its not the best experiment, but it still follows a decent idea. Technically, the variables shouldn’t matter, they are already poor perceptions of or society. A car breakin shouldn’t matter how it looks, what street its on or what clothes you wear (aka if you are using a tool to get in to an alarmed car in front o a cop car wearing meh clothes, you should be question at least by aforementioned cop). The black dude wore similar clothes that celebrities wear on days when they’re out in public yet its a criminal look if they wear hoodie, meh pants and black shirt. In a scientific experiment variable definitely, but in a practical societal setting it should not.