AbstractScholars have observed that federal circuit judges’ voting behavior can be influenced by even a single colleague on a three-judge panel. I explore whether such forces extend beyond voting to affect how circuit judges use binding precedent to develop circuit law, by examining whether the role of ideology is dampened when a judge writes for a panel that includes one or two colleagues from a different party. Using an original data set of published search-and-seizure opinions from 1953 to 2010, I uncover evidence that panel effects do extend beyond voting to influence opinion drafting as well.