Laser Misuse (Vehicles) Bill [Lords]

Will not the Bill throw into doubt the long-established police practice of an officer on foot jumping into the highway and waving a torch at a motorist in order to stop a vehicle? Would that not be an offence under the Bill because a strict liability offence is proposed, as I understand it, or does my right hon. Friend expect the police to have to pray for salvation and to rely on clause 1(2) to argue that they have a defence?