The purpose of this class is to familiarize students with practical applications of bilingualism research in the field of forensic linguistics. I will begin with an overview of the areas of forensic linguistics that require our expertise and responsibilities of a forensic expert. Then, we will consider ways in which research on cognitive and affective aspects of bi- and multilingualism informs the field and more specifically the study of interactions between second language users and law enforcement. To examine what happens in such interactions, we will analyze a range of data, including data from murder and terrorism trials where I had testified as a forensic expert.