texas. barrett's attorney claims he was bipolar but was off his meds the night of the attack. later he went to this bar and showed off the video to bystander, one of them an off-duty police officer. knockout incidents have dated as far back as 1992, but video that has gone viral. from states like illinois to washington to new york. the purpose of the so-called game is to knock unsuspecting pedestrians out cold with a single punch. the barrett case has prompted lawmakers to re-examine state versus federal hate crimes. >> state law just enhances hate crimes. in other words, your sentence is enhanced if it is proved that you committed a hate crime. however that's defined in a particular state. but under federal law hate crimes are a separate crime, which again raises some questions about the constitutionality of the equal protection clause. >> reporter: barrett's attorney