Updated

Davie, FL (SportsNetwork.com) - Miami Dolphins safety Reshad Jones has been suspended without pay for the first four games of the 2014 regular season for violating the NFL policy on performance enhancing substances.

Jones will be eligible to return to the Dolphins' active roster on Monday, September 29 following the team's September 28 game against the Oakland Raiders.

"I was very disappointed when we found out about Reshad's suspension," Dolphins head coach Joe Philbin said. "When we talked to him, Reshad pledged to learn from this situation. Our secondary as a unit, including Reshad, has performed well this offseason and I have complete confidence in the group as we progress through training camp and into the regular season."

Jones is eligible to participate in all preseason practices and games.

"The NFL recently informed me that I tested positive for a substance that is banned under the NFL performance enhancing substances policy," said Jones. "I worked closely with the union to investigate what happened, and I learned that a supplement I took caused the positive test. I deeply regret not investigating the supplement carefully before I took it, and I will never again take a supplement without having it checked. I am very sorry for the effect of my mistake on my teammates and coaches. I apologize to them, Stephen Ross, the Dolphins organization and fans. During the time away from the team, I will maintain an intense training program so that I can help my team as soon as I return."

Jones started all 16 games for Miami last season, recording 84 tackles, 1 1/2 sacks and one interception. In four seasons with the Dolphins, he has played in 60 games (46 starts) and has 224 tackles, 5 1/2 sacks and seven picks.