According to The Daily Herald, the investigation cleared Dr. Linda Brunton, who is a psychology professor.
The college said Brunton asked, but did not require, students to wear rainbow ribbons to experience prejudice directed at gay people.
The college released a statement Thursday and said there would be no additional comment.
“The college is satisfied with the investigation which yielded that the ribbon assignment was not mandatory, that the student’s first amendment rights were not infringed, and that there was no evidence of discrimination based on religious beliefs,” the statement read.
The investigation was conducted by Randy Elston, director of the Columbia State Human Resources Department, whose findings were submitted to the college in a document dated Aug. 26.
The investigation was undertaken after the Alliance Defending Freedom sent a complaint letter to Columbia State President Janet Smith.
The organization, based in Scottsdale, Ariz., describes itself online as “a servant ministry building an alliance to keep the door open for the spread of the Gospel by transforming the legal system and advocating for religious liberty, the sanctity of life, and marriage and family.”