“From now on, forcing a worker to wear a mask must be very well motivated and justified,” says the labor lawyer Pedro Vidal. “Each company must have an occupational risk prevention service that, analyzing the nature of the activity and the particular circumstances of each company, determines whether they are necessary or not”, explains the lawyer from the Col lectiu Ronda Oriol Arechinolaza. Elements such as the number of workers, whether they are concentrated in a small or large space, the distance between one and the other, whether there is continuous verbal communication between employees, the ventilation mechanisms or whether outside personnel enter the company or not, are some of the factors that prevention technicians should evaluate.