Personally, I have seen a number of Radar training class material even the Guidelines put forward by the NHTSA and non of them had any material on visual estimates,
While I am not radar certified, many of my officers are and they tell me that they did, indeed, have to conduct quite a number of visual estimations with a 100% success rate in order to pass that portion of the class. I recall being told that the visuals had to be within +/- 2 MPH. It is the CHP that conducts most of the radar courses I am aware of, we don't use "speedlabs" or any such outfit.
I believe the whole visual estimate comes form a number of cases which say police can not stand out on the highway fishing for someone speeding with a radar gun. Those case said the officer must first establish the person was speeding buy a visual estimate before confirming the speed with a radar gun.
That is how they are trained - that the visual estimation is confirmed by the radar reading.
The simple fact you not find any material that is written down on how to teacher of train someone how to estimate someone speed by visually make me wonder.
No, it just means that the specific materials are proprietary. You cannot find the manuals for most of the classes I have taken, yet I am certified as an instructor in a number of areas where the curriculum is not available on the net. I am certain that the officers that have taken the course will have that info in their training manuals. And, if you are really curious, you can contact the California Peace Officer Standards and Training office in Sacramento and request a syllabus or outline for the "radar certification" course. They can probably provide you with the minimum standards as established by california.
I have saw that pencil drop tacked a number of times, however, I have yet to hear a single person who was successful at using it.
Same here. Seen it used, but never seen a court buy it.
IMHO - visual speed estimate is a wild guess at best and so it basically your guilty by a guess
An educated guess based upon training and experience sort of hedges that guess.
The same is true with DUI or even drug influence enforcement. The officer is not guaranteeing impairment, only asserting that the observations are consistent with those of a subject who is under the influence of a type of substance.
Zigner, as a note, I am not with the CHP ... I get to enforce ALL the California codes!
- Carl