Jackson was suspended for unauthorized use of Adderall, according to a source with knowledge of the situation. The suspension cost the fifth-round draft pick from Cal-Poly four game checks totaling $91,764 -- $22,941 per week.
"It's a huge relief," Jackson told The Baltimore Sun. "Being away from the team, being away from football, I haven't really had that experience before because I've never really gotten in trouble. I made a mistake, I owned up for it. Sitting down for four weeks really gives you some perspective on where you're at in life."
Jackson spent the past month back home in Sacramento, Calif.
The Ravens were granted a roster exemption for Jackson and have until Jan. 14 to decide whether to place him on the active roster.
He said the organization has been supportive of him since he was punished by the NFL.
"That was a shock to me. I thought it would be different," Jackson said. "I'm happy to be back. I feel real accepted coming back. I'm trying to pick up right where I left off."