I was driving on I95 in maryland doing about 80 in a 65. I had my X50 mounted high above the RVM. Then I see this brown colored state trooper vehicle pull into the median from the other side of traffic. As soon as I saw him, I slowed to about 70. Then a red suv was driving a little faster than me but didn't lower his speed. I'd say he was doing about 80. My X50 never went off but I can see the officer from about 1000 or so feet away holding a device in his hands which emitted yellowish light. After he pointed the light at my direction, he raced off and pulled the red suv over. Was this laser? If so, why didn't the X50 alert? If it was laser, can you tell if it was an LTI Marksman 20/20 or a laser atlanta.