Works in Aus anyway
Source:..........Last December he was driving down a busy road on Queensland's Sunshine Coast when he was pulled over by a cop who said he was doing 79km in a 60km zone - but the cop pinged him from 250m away.
Engineer Dr Wolfgang Garwoli is an expert on speeding devices and has given evidence in court which has helped people beat them.
He says it is unlikely the gun could be accurate from such a distance.
"The gun will certainly be accurate well over that range but the policeman will not," he said....... [/b]