A two-year letterman at Washington State, Jackson has spent time in training camp with Seattle (1998 and 1999) and Tennessee (2000). He spent part of the 1998 season on Tampa Bay's practice squad and was on Green Bay's active roster for one game during the 2002 season.
Jackson's signing could mean the Dolphins have given up on the idea of Gadsden re-signing with the team. The Dolphins have a standing offer to Gadsden for the veteran minimum of $530,000 plus incentives, but it wouldn't be a surprise if Gadsden waited a while to see if he can get a better offer elsewhere.
So far, that offer hasn't come.
In other news:
-- Offensive tackle Marcus Spriggs, one of the Dolphins' last remaining unrestricted free agents, signed a one-year contract with the Green Bay Packers.
-- Running back Robert Edwards underwent arthroscopic surgery to remove bone chips from an ankle and will miss the rest of the current quarterback school.