Speed Detection Devices Are Often Used to Record the Speed

Speed detection devices are often used to record the speed of automobiles on highways. When considering the use of such devices:

A) the courts have generally taken judicial notice of the scientific reliability of speed detection devices as recorders of speed.
B) as courts have taken judicial notice of the reliability of radar speed detection devices, it is not necessary for the prosecution to offer evidence of the reliability of newly used devices.
C) since the reliability of radar devices was challenged in a Florida case, such devices are no longer used.
D) as radar and other devices are scientifically recognized as reliable, the officer will not be required to establish that the radar unit was operating properly at the time it was used.