The complicated landscape for employers who conduct drug testing for marijuana is further complicated by Callaghan. An employee’s off-duty use of marijuana may cause the employee to test positive on a workplace drug test because marijuana may stay in the fatty tissues of the body for weeks. While Callaghan certainly will be appealed, the ever-swirling debate surrounding marijuana and a growing sense, in some quarters, that marijuana use is acceptable (both recreationally and medically) highlight the need for employers — in Rhode Island and elsewhere — to consider the marijuana laws affecting their workplaces and how they will handle the question before an actual issue arises.