QUOTE (BB Law @ Tue, 27 Sep 2011 - 19:13)

Whilst on the topic of corroboration, I'd be interested to hear members views on the issue of whether an officer must form an opinion that a vehicle is speeding BEFORE corroborating that opinion evidence with a speed detection device. I.e. whether it is fatal to the prosecution if the opinion was formed AFTER taking a reading.
The consensus appears to be that their is no strict requirement that the opinion is *prior*, but it must be independent. An opinion formed by a witness after seeing the corroboration is IMHO not independent.
edit: If a talivan operator pings say 200 vehicles in an enforcement session, and performs several enforcement sessions per week (if not per day), what contemporaneous notes does he use (or need) when he describes forming an opinion that a specific vehicle was speeding in 'his' witness statement (that someone else writes and he just signs) several months later?