It’s the fourth annual Telework Week in the U.S., a time for organizations and individuals to give telecommuting a try. The group that organizes the week, Mobile Work Exchange, a public-private partnership committed showing the value of telework, has gathered pledges from almost 150,000 people who promise that they will work remotely this week.

Companies have picked up on the benefits of telecommuting—it helps the environment, saves money and gives workers more flexibility in their schedules—but it’s also clear that letting employees work from the couch raises some legal risks for employers.