The digital age makes everything so much easier - but that can lead to really bad mistakes. Like this teacher in Elk Grove Unified Sch. Dist. (same one as in the Pledge case) that included 6 seconds of her sex life on a DVD sent home with kids. Here is CNN video via Scott McLeod.
The point is that mistakes happen, so keep your personal life extremely separate from your professional life. It is inefficient for personal and professional to not share devices, but that inefficiency may keep mistakes like this from happening to you. Maybe someday we'll get to the point where districts provide professional devices, like companies do laptops, so as to avoid this issue.