For starters, he's got those pesky visions that keep popping up ever since his heart stopped beating. But the bigger issue is Mike's increasing dependence on painkillers. And if Thursday's episode is any indication, it's only a matter of time before his habit turns into a full-blown addiction - one that may seriously jeopardize the team's investigation.
In the exclusive sneak peek below, Mike jumps at the chance to interrogate a junkie that he and Johnny (Manny Montana) have brought in. But it's unlikely that information is the only thing that he's after, and Johnny's definitely starting to notice that something's up with his colleague.
Graceland airs Thursdays at 10/9c on USA. Check out the clip here: