A recent judgment in Brazil has created case law on the liability of farm owners for the death by lightning impact of a worker in 2019, by ordering him to continue work in the field during a thunderstorm. Subjective decision-making, based on criteria of the probability of the impact of a lightning strike or on traditional methods puts people’s lives at risk. On the contrary, as stated in the Brazilian standard ABNT NBR 16785 on thunderstorm detection, some systems make it possible to objectify the decision and save workers and assets from the imminent risk of a lightning strike.