Stationary Radar - Answers -The transition source stands still and the object receiving
the energy moves.
Moving Radar - Answers -Both the patrol vehicle and the object being tracked are
moving.
,Low doppler: reflects of roadway to detect patrol speed.
High doppler: oncoming objects (target vehicle)
Cosine Effect - Answers -When a target vehicle's direction of travel creates a significant
angle with the position of he stationary RADAR, the relative speed will be less than the
true speed. Since the change in the signal's frequency is based on the relative speed,
the RADAR speed measurement may be less than the car's true speed. This effect
always works to the motorist's advantage when the RADAR is stationary.
Three components of RADAR - Answers -Antenna, box, current
State v. Hanson - Answers -Wisconsin Court addressed the use of moving RADAR. In
addition to establishing that the unit was tested for accuracy, and the operator was
properly trained in its use, the operator must establish the RADAR was used in an area
where road conditions would distort readings as little as possible, and the PATROL
VEHICLE'S SPEED WAS VERIFIED.
Statutory speed laws - Answers -Posted limits (Ex: 15 mph in school zones)
Basic speed law - Answers -any speed under the absolute limit that is safe for existing
road, weather, or traffic conditions
PBT - Answers -Preliminary Breath Test
-Admissible in prelaminarly hearing, but not in court
What happens when you refuse to take the PBT? - Answers -Failure to take PBT, can
use as part of arrest decision
-Assume they would fail
Illegal "per se" Statute - Answers -Operate, any vehicle, within the state, while having a
BAC at or above state level's
SFST Validity - Answers -HGN: 88% accurate
Walk & Turn: 79% accurate
One Leg Stand: 83% accurate
Standardized Elements of SFST's - Answers -Standardized admin. procedures
Standardized clues
Standardized criteria
OWI Detection Phases - Answers -1. Vehicle in motion: stop?
2. Personal contact: exit?
3. Pre-arrest screening: arrest?
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