Summarize this article in one sentence.
Students generally talk to their friends about tests and even about the answers to tests. For example, keep an eye on students who leave your first period class after a test or exam. If they walk a little with a second period student, they may be sharing answers or passing cheat sheets. Some students will create a private group on Facebook or Google for the class, using it to exchange notes. If the class is large enough, you might be able to sign up for the group posing as a student, using an assumed name. Some course management systems, such as Blackboard, have an option of letting students email each other without the instructor seeing the emails. Change the preferences so that you also see the emails that students send out through the system. Often, students might pretend that they are interested in the class, visiting you in office hours and engaging with the class material. These students might butter you up so that you don’t suspect them of cheating because you perceive them to be good students. Do not allow students to be in your classroom when you are not there. Lock filing cabinets and desk drawers to prevent students from looking at tests, assignments, or exams, and watch for this behavior when you are in the classroom as well. Create and memorize complex passwords for the computer and grade book log-ins; do not write this information on paper.

Summary:
Listen to hallway conversations. Sign up for the class social media group under an assumed name. Be cautious with favorite students. Protect your physical and digital spaces.