Last week, Philadelphia judge Charles Hayden dismissed evidence in state Rep. Cherelle Parker's DUI case that included results from a Breathalyzer test that measured Parker's blood alcohol content at .16. Hayden and Parker are friends on Facebook. "The rules are quite general that the judge should avoid situations where his impartiality might reasonably be questioned," said Eleanor Myers, associate professor at Temple's Beasley School of Law. "It's not only what's in your mind, but what people will perceive."