Approaching Waco heading northbound I was clocked using Laser by Texas State Trooper (was using Valentine One radar/laser detector). Trooper was off highway located in a place of business parking lot, firing laser down I-35 at northbound traffic. This location used was so far off the highway no normal eye scanning pattern could even come close to looking his direction. I made the mistake of ignoring my laser detector when I was hit (thought it was an error/false). Drivers beware this trooper is good! State troopers now using laser on a more frequent basis. This is bad news because the detection is very difficult.