Why didn't the police show Andy Krawczyk some pictures of Omar?

I just rewatched Stringer's death scene.

The real estate developer (Andy Krawczyk) who was punking Stringer and Avon for money, saw Omar shooting Stringer's guardian.

Couldn't that show him pictures of possible shooters (I bet Omar would have been somewhere on the top of the list)?

Ok, I get it that there might be like 300 potential suspects. They also heard on the wire that Barksdale's people were blaming Stringer's death on Marlo.

Not to mention that Vernon Holley took the case, and he isn't the smartest detective in the room. He was almost duped that Omar killed a civilian.

But wasn't that one of the major police fuckups in the series. Not like its the only one - the police messed up a lot of murders.

Even REAL LIFE Baltimore police has a low closing rate - Baltimore Homicide List

Still, I think Andy would have recognized Omar, and its not like Omar can pressure a downtown civilian. He seems to be respected in the ghetto, but I doubt he could lean on Andy, who has Clay Davis as connection.