More and more companies are being sued for discrimination by job applicants who have legally been prescribed medical marijuana, after they failed pre-employment drug screenings or because of their use of the substance. The issue of medical marijuana is difficult in terms of the employment picture, especially now that 33 states and the District of Columbia have legalized its use. Of those states, 16 provide workplace protections, either through their own law or case law since their medical marijuana laws were enacted. To confuse the issue further, marijuana is still illegal under federal statutes, putting employers in a difficult position…