ALBUQUERQUE, N.M. — An attorney for two Native American brothers pulled from a Colorado State University tour earlier this year asked the school for policy changes, saying Wednesday that campus officers violated the teens’ constitutional rights by stopping them and patting them down without any suspicion of a crime.

A letter from American Civil Liberties Union attorney Sarah Hinger demands the university revisit its campus police policies and training to avoid another “humiliating” situation similar to the April 30 encounter.

Video shows two officers stopping Thomas Kanewakeron Gray and Lloyd Skanahwati Gray and checking their pockets as they toured the school, which the brothers from New Mexico had called their top college choice.

Police said a mother on the tour had called 911, saying she was worried because the Grays were “real quiet” and wore dark clothing.

The incident was met with shock and outrage nationwide, as one of numerous examples of racial profiling to make headlines this year.

A message requesting comment from university spokesman Mike Hooker on the ACLU letter was not immediately returned.

In an interview, Hinger told The Associated Press that the civil liberties organization is hopeful university President Tony Frank will heed the calls to conduct more campus police training and a review of policies dictating how officers and dispatchers respond to “bias based” reports on campus.

But the ACLU is not taking “any avenues off the table” — including possible legal action — should the university not follow through on its requests, she said.

“The Gray brothers were confronted, detained, and searched by CSU police, leaving them humiliated, scared, and literally marginalized,” Hinger’s letter said. “This exercise of sanctioned police power magnified and legitimized the bias of an individual and created an injury beyond what a private individual could inflict alone.

“For this reason, it is imperative to revisit both policy and training if the university hopes to prevent its police from being used as a tool of bias in the future,” she wrote.

The school previously said it would refund the money that the teens spent on travel and take steps to prevent a similar situation from happening again, including the use of lanyards or badges to identify tour guests.

Frank also has decried the Grays’ experience, saying they “wound up frightened and humiliated because another campus visitor was concerned about their clothes and overall demeanor — which appears to have simply been shyness.”

“The very idea that someone — anyone — might ‘look’ like they don’t belong on a CSU Admissions tour is anathema,” he said in an email to students last spring.

In this photo from body camera video, two Native American teenagers are questioned by Colorado State University campus police after they were pulled from a college tour, Monday, April 30, in Colorado. The teen’s faces were blurred by the Colorado State University campus police. The mother of the teenagers who campus police pulled from the tour after a parent reported feeling nervous about them said she believes her sons were victims of racial profiling and she feared for their safety after learning about the encounter. In an interview Thursday with The Associated Press, Lorraine Kahneratokwas Gray described receiving a frantic phone call from her son, 19-year-old Thomas Kanewakeron Gray, about the incident at Colorado State University. (Colorado State University campus police via AP)

HOGP

This undated photog provided by the Gray family shows 17-year-old Lloyd Skanahwati Gray. Gray was with his brother Thomas Kanewakeron Gray on Monday, April 30, 2018, when Colorado State University officials say police pulled the teens from an admissions tour because a parent in the group was nervous about their presence. (Gray Family via AP)

AP

In this May 26, 2016 photo provided by the Gray family, Thomas Kanewakeron Gray walks in a procession during his high school graduation at Santa Fe Indian School in Santa Fe, New Mexico. Gray and his brother Lloyd Skanahwati Gray, were pulled from a Colorado State University admissions tour on Monday, April 30, 2018, after another parent became nervous about their presence and called police. (Gray Family via AP)

AP