Three more motorists who were caught speeding on the same day by the laser gun that clocked tycoon Peter Lam Kin-ngok's car have asked police to review their cases. That followed a similar application from a driver clocked by the same laser that recorded Mr Lam's Ferrari travelling at of up to 114km/h in a 50km/h zone on Lantau. Mr Lam successfully challenged the speeding ticket in court, arguing that the results shown on the laser gun were flawed because police were not properly trained in using the device. The speeding charge against Mr Lam was later reduced, sparking an outcry over the gun's accuracy. Nine drivers were issued speeding tickets in similar conditions as Mr Lam's. However, the other five had not applied for a review of their penalties, said traffic police Chief Superintendent Michael Demaid-Groves. Speaking after a demonstration for lawmakers on the operation of laser guns, Mr Demaid-Groves said police would seek legal advice on the four review applications and would keep the Legislative Council informed on progress this month. The chairman of the Legco transport panel, Andrew Cheng Kar-foo, who attended the demonstration, said the laser gun was flawed because it did not record the speed of vehicles. 'The accuracy of the laser gun depends greatly on the police officer's co-ordination and eyesight. One tiny mistake by the officer and the whole speed-detection operation falls through.' Mr Cheng urged police to install a device to record the speed so as to rid operators of the burden of recording it manually, but Mr Demaid-Groves said a gun with such a device would cost up to 10 times as much. However, roadside speed cameras, which serve the same function as the hand-held laser guns, were digital and had been in use for some years. Mr Demaid-Groves said police were still studying the efficiency of using digital images in prosecutions because digital evidence was a relatively new idea in local courts. All red-light cameras will be digital by 2010.