In episode 1.06 "Scary Monsters and Super Creeps", a blue hand is found on the body of one of the assassins from the previous episode, 1.05 "Gimme Some Truth". Based on Mark Benford's flashforward clue that a blue hand was linked to Baltimore, Demetri Noh decides to investigate Baltimore St. and brings Al Gough along with him. They find blue hands pointing the way to a Blue Hand club, where they find dead bodies with blue hands.
Al, Demetri and Mark later visit a Blue Hand club and arrest a member, preventing him from committing suicide. ("The Gift")