They are to be shown one at a time, then turned over face down so as not to confuse the identifier.
Each of the 46 lax players would have had to be presented with 7 non-lax players. Therefore, since Mangum actually has no idea of an ID, Nifong would have had to present 46 lax players plus 46x7=322 others. I wonder if he's allowed to "double dip" on the 322, i.e. could he "reuse" non-lax players or would they have to be 322 unique individuals?
They have to use different faces reflecting a similar description. They can't tell her if she's even picked a lax player, and the cop admimistering the photo line-up is not even supposed to know. They can'r even show them with their collars showing from their uniform photos because that's recognizable from one array to the next.
If DPD doesn't have enough photos to muster the needed number of arrays, they can get some from the FBI.