Management probably had evidence that the individuals cognitive abilities were decreasing and the previous incidences of cannabis abuse alerted them to the fact they had a ticking time bomb employee that needed to go.
All the things people do not want you to know about the God given herb, Marijuana.
"Cannabis use has been shown to impair
cognitive functions on a number of levels—from basic motor coordination to more complex executive
function tasks, such as the
ability to plan, organize, solve problems, make decisions, remember, and control emotions and behavior."
www.ncbi.nlm.nih.gov