{shout mode}
Acpo is a code of practice{/shout mode} and type approval is reliant on acpo code of practice being followed
It is not "law" but to convict of speeding they must use a type approved device. not something they bought at maplins.
The type approval was granted by the home office scientic development branch who insist ACPO
code of practice is followed as they did in thier type approval process.
all the documents are here :
http://www.safespeed.org.uk/forum/viewtopic.php?t=8339
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Speed limit sign radio interview. TV
Snap Unhappy“It has never been the rule in this country – I hope it never will be - that suspected criminal offences must automatically be the subject of prosecution” He added that there should be a prosecution: “wherever it appears that the offence or the circumstances of its commission is or are of such a character that a prosecution in respect thereof is required in the public interest”
This approach has been endorsed by Attorney General ever since 1951. CPS Code