Mateen attended Indian River State College's Criminal Justice Training program and in a questionnaire, he admitted to committing or being involved in a crime that went undetected, but did not provide specific details.He went on to earn an associate of science degree in criminal justice technology from the college in 2006.While a sophomore attending Spectrum, an alternative high school for students with behavioral issues, classmates told The Washington Post that Mateen cheered in support of the hijackers during the September 11 attacks and that he stated that Osama bin Laden was his uncle who taught him how to shoot AK-47s, all of this before knowing that bin Laden was the mastermind of the attacks.A retired dean of Martin County High School, Dan Alley, said that they "tried to counsel him and show him the error of his ways, but it never had the effect that we were hoping for," and that his father "would not back up the school, and he would always take his son's side".The test administered was the updated Minnesota Multiphasic Personality Inventory (MMPI-2), a test used for job screenings and court cases requiring those subjected to it to agree or disagree with statements such as "My soul sometimes leaves my body" and "Once in a while I think of things too bad to talk about." Carol Nudelman, the psychologist listed on the character certification submitted by G4S to the state said she stopped working for the company in 2005.After the shooting, Nudelman, who was said to have evaluated and cleared Mateen for his firearms license in 2007, according to the records of the security company G4S, denied ever meeting him or having lived in Florida at the time, and said she had stopped her practice in Florida in January 2006.A former coworker who worked with Mateen in a gated community in western Port St. He also said that he frequently made homophobic, racist, and sexist comments, and talked about killing people.Several people who knew Mateen have speculated that he might have been gay or bisexual.
Mateen began his secondary education at Martin County High School in 2000, and at the age of 14 was expelled after being in a fight in math class, where he was briefly arrested without being handcuffed and charged with battery and disrupting school, though the charges were later dropped.By September 2013, they were living in a house in Port St. She reportedly left Mateen and joined relatives in Rodeo, California, by December 2015.At the time of his death, Mateen had a three-year-old son with his second wife.He also wrote that he had experimented with marijuana as a young teenager. Skipper, who was the warden at the institution, wrote that "in light of the tragic events at Virginia Tech officer Mateen's inquiry about bringing a weapon to class is at best extremely disturbing".Following the Virginia Tech shooting in April 2007, Mateen suggested in a corrections officer training class that he would bring a gun to class. Days later on April 27, 2007, Mateen "was involuntarily dismissed" from the program and never became a certified corrections officer.