There must be a criminal unlawful offence not a tort (Lamb), it cannot be an omission (Lowe), the objective test for a dangerous act (Church) must be that a sober and reasonable person would inevitably realise the risk of some harm (Larkin), the unlawful act can be against property (Goodfellow), however, the risk of harm refers to physical harm something which causes fear and apprehension is not sufficient, if someone supplies drugs or performs preparatory acts to administer the drug but isn't the person to administer this is not an unlawful act due to free will (Kennedy), it must be proved that the defendant has the mens rea for the unlawful act, but it is not necessary to realise the act is unlawful or dangerous (Newbury and Jones)