RE:RE:RE:JokersIt's all up to the employer to decide.
If you are a worker in a large warehouse, the damage you can cause to yourself, others, and the physical insfrastructure can be huge. Imagine driving a forklift while intoxicated (thru cannabis or alcohol) and hitting a pillar that holds up those multi-story shelving units. A lot of damage both personal and property can be done in a (preventable) accident like that.
The cost of installing a solution like Predictmedix's will pay for itself in reduced accidents and insurance.
Similiar examples can be made for factories (auto, etc.) and mines (gold, silver, etc.).
Anywhere where you have large # of employees entering a facility and you need to protect the employee, their co-workers, and the physical building and contents from damage can benefit from identifying intoxicated workers before they enter the building.