Baltimore Ravens reserve cornerback Asa Jackson has been suspended without pay for the team's first eight games of the 2013 regular season for violating the NFL's policy on performance-enhancing substances.
This is the second time in nine months that Jackson has been disciplined by the NFL. He was suspended for four games in December for violating the same policy.
"My reaction to that is that you've got to follow the rules," coach John Harbaugh said after practice Friday. "If you don't follow the rules, you get suspended. That's a fair rule, there's no place for that, and he's getting what he deserves.
"As far as what it does to our corner depth, that's one less corner that we have. We'll be missing Asa those first eight weeks. Whether he'll back after that, time will tell."
Jackson wrote on Twitter that his prescribed medication for attention deficit disorder triggered his positive test. He released a statement to the Baltimore Sun.
"I was diagnosed with a condition that can be treated with a medication allowed under the NFL/NFLPA policy after a player obtains a therapeutic use exemption. I now have the required approval, but the positive test occurred before it was approved. The policy is very strict, so I have chosen to be immediately accountable," Jackson said in the statement.
"I sincerely apologize to my teammates, coaches, and Ravens fans. I look forward to working hard in training camp and preseason, training hard during the discipline period and contributing to the team immediately upon my return."
Jackson is eligible to return to the Ravens' active roster Nov. 4, following the team's game against the Cleveland Browns. He can participate in all preseason games.
A 2012 fifth-round pick, Jackson played in three games last season. He has one special teams tackle.
Information from The Associated Press was used in this report.