Im sure being woken up at 6am wouldn't be a pleasant experiance by the police, but if the system has got flawwed data on it then when the person was arrested and re-tested it would be obvious it wasnt that person. Then look on the positive side....... A serious crime/rape/murder etc happens and they look on the system. Low and behold the computer says it was x, y or z and the person is duely arrested quickly before commiting several more offences.....
Still a bad idea?
As for you paying for it? If i were to need one for work, I have already spoken to my bosses and they said if as an airside worker I needed one they would be liable to pay for it under T&C's