bernerth and walker sought to determine if the common assumption that consuming
weed
at and during work causes substandard work performance was, in fact, true.
surveying 281 employees and their direct supervisors, the researchers considered marijuana’s influence on performance, especially as it related to core job requirements, helping colleagues or their organizations, and counterproductive behaviour on the job. each employee was asked about cannabis use frequency and timing related to their work shifts.
supervisors were more likely to report reduced helpfulness toward the organization and increased counterproductive work behaviours among employees who reported using cannabis before and during work hours, the researchers note. with use after work, again, “the results showed no discernable effects.”
employers have substance policies and may use testing to determine the presence of matabolites, which some may equate to impairment.
“since our study shows that off-the-job cannabis use has little to no impact on workplace performance, organizations will be hard-pressed to provide legally defensible justifications for the continuation of policies prohibiting all forms of cannabis use,” bernerth notes.