There's a non-realtime camera cut, at least in the non-commercial version that originally aired - Jack and his partner pull away from the prison and then the scene transitions immediately and directly to them already driving on the highway and talking about the body at the NIH building.
Jack Bauer returns to work at CTU with an illicit drug addiction, apparently not known to anybody in the federal government. A full physical exam of Jack including blood and urine tests performed for illegal drugs would have been required for anyone returning to work at that secret agency.