Johnson accepted a football scholarship from
Eastern Washington University. As a
redshirt freshman, he posted 11 starts, 83 tackles (second on the team), five tackles for loss and four interceptions. He made 10 tackles against
Texas Tech University. He had two interceptions against
Western Washington University. He made 12 tackles against the
University of Northern Colorado. As a sophomore, he tallied 101 tackles and six interceptions, the latter leading the conference. He had 16 tackles against
Weber State University. He had four interceptions against
Portland State University, tying a single-game conference record. He had 14 tackles against the
University of Montana and
Montana State University. As a junior, he helped the team win the NCAA Division I FCS National Championship, while registering 105 tackles (third on the team), five interceptions, eight passes defended, two forced fumbles and one fumble recovery. He also contributed to the defense being ranked number one nationally with 26 interceptions and 47 turnovers forced. He had two interceptions against the
University of Montana. He was named a team co-captain along with his twin brother Zach. As a senior, he missed the final four games with an injured shoulder, recording 52 tackles (fourth on the team), eight tackles for loss (led the team), two interceptions, 1.5 sacks, one quarterback hurry, two forced fumbles and earned All-Big Sky conference honors for the second straight season. He had four tackles (two for loss) and one sack against the
University of Washington. He injured his shoulder against the
University of South Dakota, but still managed to intercept one pass and then had back-to-back games with nine tackles /against the
University of Montana and
Montana State University, while fighting through the injury. He finished with 45 starts, 341 tackles (fifth in school history and eighth in the
Big Sky Conference), 22 tackles for loss, 30 passes defended, 17 interceptions (tied for the most in school history) and six forced fumbles (the most in school history). ==Professional career==