This chapter discusses immunity and affirmative defenses under the Michigan Medical Marihuana Act (MMMA), MCL 333.26421 et seq. This chapter also discusses the Medical Marihuana Facilities Licensing Act (MMFLA), MCL 333.27101 et seq., and the Marihuana Tracking Act, MCL 333.27901 et seq. Finally, this chapter addresses recreational marijuana use under the voter-initiated Michigan Regulation and Taxation of Marihuana Act (MRTMA), MCL 333.27951 et seq., and the process for setting aside misdemeanor marijuana offense convictions based on conduct that is now legal under the MRTMA.