In 2021, Arnold redshirted and did not play in any games. In week six of the 2022 season, Arnold recorded his first career interception off a pass by
Haynes King before breaking up a pass in the end zone on the final play of the game to help the #1 Crimson Tide survive
Texas A&M 24–20. In week 11, Arnold tallied ten tackles, two pass breakups, and a fumble recovery, as helped Alabama beat
Ole Miss 30–24. Arnold finished the 2022 season with 45 tackles with one going for a loss, eight pass deflections, an interception, and a fumble recovery. For his performance on the season, Arnold was named a 2022 Freshman All-American by
FWAA. In 2023, Arnold was named a first-team
All-American after recording 63 tackles, 5 interceptions, a sack, and forced fumble. He declared for the
2024 NFL draft following the season. ==Professional career==