In 2015, Mason co-sponsored legislation allowing individuals and businesses to refuse services to same-sex couples based on religious beliefs. The “Preservation of Religious Freedom Act” could have legalized discrimination based on sexual orientation.
According to a 2018 Maine Citizen Stewardship Voter Guide, Mason opposed marriage equality and supported defining marriage as between one man and one woman.
2015: Mason Co-Sponsored Legislation That Allowed Individuals And Businesses To Refuse Services To Individuals That Conflicted With Religious Beliefs, Including Same-Sex Couples. According to the Portland Press Herald, "The three top Republicans in the Maine Senate have signed on as co-sponsors of a so-called religious freedom bill similar to legislation that has sparked controversy, protests and threats of boycotts in Indiana and other states. [...] The bill, L.D. 1340, says that state and local governments cannot 'substantially burden a person's exercise of religion' unless there is a 'compelling governmental interest.' The legislation states that exercise of religion includes 'the ability to act or refuse to act in a manner substantially motivated by a person's sincerely held religious belief.' Supporters argue that such laws are needed to prevent individuals or business owners from having to provide services that effectively support or sanction activities -- such as a same-sex marriage -- that violate their religious beliefs. [...] Burns picked up the support of his party's three Senate leaders: President Mike Thibodeau of Winterport, Majority Leader Garrett Mason of Lisbon Falls and Assistant Majority Leader Andre Cushing of Hampden." [Portland Press Herald, 4/15/15]
2018 Maine Citizen Stewardship Voter Guide: Garrett Mason Supported Defining Marriage As Between One Man And One Woman. According to the 2018 State Of Maine Citizen Stewardship Voter Guide,
[State Of Maine Citizen Stewardship Voter Guide, 2018]