I think the GGP was referring mainly to workplaces that don't involve dealing with dangerous equipment. Besides there's a big difference between smoking some pot outside of work hours and coming to work under the influence of meth.
When I worked in low paid (mainly call centre) jobs, people coming to work high was a pretty common thing. The jobs were easy and repetitive enough that it didn't affect performance at all. In fact if they had started drug testing they would probably have lost many of their best employees.
When I worked in low paid (mainly call centre) jobs, people coming to work high was a pretty common thing. The jobs were easy and repetitive enough that it didn't affect performance at all. In fact if they had started drug testing they would probably have lost many of their best employees.