The treatment of driving staff's health data or functions related to the traffic safety of rail transport services to detect, by the company, alcohol or drug consumption, at the start or during working time, is enabled in Articles 6.1.c) and 9.2.h of the GPD in relation to rail legislation. In the case of personnel who carry out these duties in the transport services of the bus or cable network, the data protection regulations do not prevent regular controls on the consumption of the aforementioned substances, when it is established, justifiably, by the occupational risk prevention service, insofar as it may constitute a risk for third parties.