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Speeding Tickets & Traffic Citations Discussion of appropriate procedures and guidelines to successfully fighting speeding tickets and related traffic citations.

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  #1 (permalink)   IP: 184.88.68.175
Old 2011-01-05
rxbg rxbg is offline
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Default laser gun ticket in FL

Hi all. Just got nailed from behind with a laser gun and have to go to court. I am planning my defense and came across a potential loophole in the law that might help me. According to state law Laser guns actually have to have "audio doppler" on while they are being operated. I was hit with a LAser Pro III and the only place in the manual where i can find anyhting remotely related to what could be "audio doppler" in instruction manual is here:

Audio Volume
The audible tone provides feedback to assist the
operator in aiming the ProLaser III. The aiming tone is
activated when the trigger is pulled and a staccato or
chirping tone is heard when no valid target is in range,
such as aiming the unit at the sky. As the quality of
range data from a target improves, the “chirp rate” will
increase, indicating proper aiming of the ProLaser III.
When a range or speed is actually displayed, the chirping
will simultaneously change to a solid tone.
The audio transducer is also used to alert the
operator to certain conditions such as an internal test
failure, existence of low battery voltage or confirmation the
unit is powering down.


this sounds to me like this is not really a doppler signal, but more of an alignment function of some kind. or is it?

my plan is to tell the court that the equipment used does not have the required function (audio doppler) as required by state law. in doing so i realize i am insinuating that there is an error in the fl statutes and that basically all tickets issued with this modelof laser gun are inadmissible in court.

any comments.

ps- i have scoured the internet, read the laws, and short of getting into some technical, detailed obssessed deliberation in court about the conditions at the time of the ticket, cosine, traffic interference,and blah blah blah blah i don't have a chance of defeating this ticket in court.
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  #2 (permalink)   IP: 74.74.83.48
Old 2011-03-13
drkshdw983 drkshdw983 is offline
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I'm probably too late to help any but it sounds like a reasonable defense... the Doppler effect is the measuring of wavelength changes as they bounce off of objects (how radar speed guns work)... The word "audio" in the description is tricky because even though you can't hear a radar based speed gun it is in fact a type of audio. If the law you've cited is still in effect than the laser gun alone would not be sufficient to write a citation, your speed would have also had to have been verified via radar. I'm interested in how your court case turns out, please let me know!
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