On my way to work Friday morning I found out the hard way that X band is still used by Virginia State Police. That morning I took I-64 to work for the first time because of a backup on my normal route. I was in a line of 15-20 cars, all doing 75, in the far left hand lane when my X50 alerted to briefly to X band at about half strength, then went silent. I slowed down and checked my mirrors since I wasn't familiar with the route. The X50 stopped alerting and the coast looked clear, so I resumed my speed at the back of the pack. About 15 seconds later I got another half sthrength X band alert. This time when I checked my rearview, I saw a trooper on a motorcycle right on my tail. I moved to the middle lane and reduced my speed, hoping he would pass and go after one of the other cars still doing 75. Unfortunately, he preferred easy prey, turned on his lights and fell in line behind me. I stashed the detector under the seat and pulled over to the shoulder, wondering if he'd paced me or if he was really using X band. I'd get my answer shortly. He said he saw me go by as the last car in line and tried to get my speed, but couldn't, so he pulled in behind me and was able to get a reading when he tried a second time. That explained both alerts...without a doubt, he was using X band, and once again I'll be appearing in court at the request of one of Virginia's finest. I had been considering turning off X band since I'd never seen it used around here. I'll definately keep it on now, and I'll never ignore X in an unfamiliar area.