Using cellphones to cheat at roulette

The casino at the Ritz hotel in London had a trio of Eastern European gamblers were arrested on suspicion cheating at roulette using a laser scanner attached to a cellphone (they'd manage to win 1.3 million pounds, something which quickly aroused the attention of the casino's management). There's only one problem: no one is even sure that it's possible to cheat at roulette using a laser scanner. Actually, there are two problems: cheating a casino is apparently not against the law in Britain. How come we're only just learning this?