How are lasers guns aimed? I know they try to aim at a reflective surface, such as license paltes or headlights. But how is this done? The LEO must aim it in the general direction of the target vehicle, but then does he manually have to aim it at the plate and then if no reading try a headlight, or center mass, or does the gun itself try to aim/focus on a surface that gives a return suing some computer program to judge the return signal and seek to adjust based on feedback..
The reason why I am asking is to determine the effectiveness of placing my V1 high up near the mirror or lower but above the wipers and the relative need of various coutnermeasures (Veil, jammer, etc.). Supposedly it makes no difference where the V1 is placed. But if the cone of the laser is only three feet it would seem that lower is better.
On the other hand I have to imagine that if this is being done manually at a moving, bouncing target, that the aiming point would initially not be that exact and some light could first reach a detector mounted near the rear view mirror as the gun swings up and down to find a spot that gives a reading. If the aiming point is mechanically assisted by some software the re-aiming would probably be fast, but might swing in a wider arc that would cause an alert. On the other hand if it is being done manually it might be slower, but with less of an arc (unless the LEO has the shakes).
I read that a laser gun can get a reading in one second. Is that reading autmatically recorded? If the gun aim later moves off a focus point that give am initial reading, is the reading lost until a result is reacquired and only preserved when the LEO presses a record button?
Finally is there a thread that talks about the maximum distance by state at which the law allows a laser result to stand in court. I think I read about some states requiring that the detection be within 1,000 feet, or is that just for radar? Do LEO's usually wait until the target is within the required distance and then aim the laser, or do they check vehicles further away and then continue to train on them until they reach the needed distance?